v3.8.0.1
Acquisitions - Impact of Acquisition, Income Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]                      
Crude oil transportation services                 $ 345,733 $ 374,949 $ 300,436
Natural gas transportation services                 122,364 119,962 119,895
Sales of natural gas, NGLs, and crude oil                 108,503 77,123 82,133
Processing and other revenues                 79,298 39,628 40,197
Total revenues $ 174,766 $ 175,869 $ 160,863 $ 144,400 $ 162,211 $ 153,268 $ 149,015 $ 147,168 655,898 611,662 542,661
Cost of sales                 91,213 71,650 75,285
Cost of transportation services                 46,200 47,669 46,840
Operations and maintenance                 62,069 55,070 50,823
Depreciation and amortization                 90,800 86,247 84,258
General and administrative                 65,536 57,298 52,635
Taxes, other than income taxes                 28,832 25,400 21,796
Contract termination                 0 8,061 0
(Gain) loss on disposal of assets                 (599) 1,849 4,795
Costs and Expenses                 384,051 353,244 336,432
Operating income 67,674 74,003 66,944 63,226 73,272 66,943 54,758 63,445 271,847 258,418 206,229
Interest expense, net                 (89,348) (45,601) (18,330)
Unrealized gain (loss) on derivative instrument                 1,885 (1,291) 0
Equity in earnings of unconsolidated investments                 237,110 54,531 2,759
Other income, net                 1,221 1,723 2,413
Nonoperating Income (Expense)                 160,596 9,362 (13,158)
Net income before tax                 432,443 267,780 193,071
Deferred Income Tax Benefit (Expense)                   (17,741) 7,277
Net income (93,197) 170,777 79,167 67,238 64,610 60,402 80,721 44,306 223,985 250,039 200,348
Net income attributable to noncontrolling interests (72,180) (154,911) (70,414) (55,209) (52,307) (49,750) (81,161) (33,032) (352,714) (216,250) (156,035)
Net income (loss) attributable to TEGP $ (165,377) $ 15,866 $ 8,753 $ 12,029 $ 12,303 $ 10,652 $ (440) $ 11,274 $ (128,729) 33,789 44,313
Tallgrass Energy GP, LP                      
Business Acquisition [Line Items]                      
Crude oil transportation services                   374,949 300,436
Natural gas transportation services                   119,962 119,895
Sales of natural gas, NGLs, and crude oil                   77,394 82,133
Processing and other revenues                   32,817 33,733
Total revenues                   605,122 536,197
Cost of sales                   71,920 75,285
Cost of transportation services                   58,341 53,597
Operations and maintenance                   53,386 49,138
Depreciation and amortization                   84,896 83,476
General and administrative                   55,829 51,479
Taxes, other than income taxes                   24,727 21,796
Contract termination                   0  
(Gain) loss on disposal of assets                   1,849 4,795
Costs and Expenses                   350,948 339,566
Operating income                   254,174 196,631
Interest expense, net                   (45,601) (18,330)
Unrealized gain (loss) on derivative instrument                   (1,291)  
Equity in earnings of unconsolidated investments                   51,780 0
Other income, net                   1,723 2,413
Nonoperating Income (Expense)                   6,611 (15,917)
Net income before tax                   260,785 180,714
Deferred Income Tax Benefit (Expense)                   (17,741) 7,277
Net income                   243,044 187,991
Net income attributable to noncontrolling interests                   (216,250) (156,035)
Net income (loss) attributable to TEGP                   26,794 31,956
Tallgrass Terminals, LLC                      
Business Acquisition [Line Items]                      
Crude oil transportation services                   0 0
Natural gas transportation services                   0 0
Sales of natural gas, NGLs, and crude oil                   99 0
Processing and other revenues                   12,043 7,689
Total revenues                   12,142 7,689
Cost of sales                   100 0
Cost of transportation services                   788 800
Operations and maintenance                   1,684 1,685
Depreciation and amortization                   1,351 782
General and administrative                   1,469 1,156
Taxes, other than income taxes                   673 0
Contract termination                   8,061  
(Gain) loss on disposal of assets                   0 0
Costs and Expenses                   14,126 4,423
Operating income                   (1,984) 3,266
Interest expense, net                   0 0
Unrealized gain (loss) on derivative instrument                   0  
Equity in earnings of unconsolidated investments                   2,751 2,759
Other income, net                   0 0
Nonoperating Income (Expense)                   2,751 2,759
Net income before tax                   767 6,025
Deferred Income Tax Benefit (Expense)                   0 0
Net income                   767 6,025
Net income attributable to noncontrolling interests                   0 0
Net income (loss) attributable to TEGP                   767 6,025
Tallgrass NatGas Operator, LLC                      
Business Acquisition [Line Items]                      
Crude oil transportation services                   0 0
Natural gas transportation services                   0 0
Sales of natural gas, NGLs, and crude oil                   0 0
Processing and other revenues                   6,228 6,332
Total revenues                   6,228 6,332
Cost of sales                   0 0
Cost of transportation services                   0 0
Operations and maintenance                   0 0
Depreciation and amortization                   0 0
General and administrative                   0 0
Taxes, other than income taxes                   0 0
Contract termination                   0  
(Gain) loss on disposal of assets                   0 0
Costs and Expenses                   0 0
Operating income                   6,228 6,332
Interest expense, net                   0 0
Unrealized gain (loss) on derivative instrument                   0  
Equity in earnings of unconsolidated investments                   0 0
Other income, net                   0 0
Nonoperating Income (Expense)                   0 0
Net income before tax                   6,228 6,332
Deferred Income Tax Benefit (Expense)                   0 0
Net income                   6,228 6,332
Net income attributable to noncontrolling interests                   0 0
Net income (loss) attributable to TEGP                   6,228 6,332
Consolidation, Eliminations                      
Business Acquisition [Line Items]                      
Crude oil transportation services                   0 0
Natural gas transportation services                   0 0
Sales of natural gas, NGLs, and crude oil                   (370) 0
Processing and other revenues                   (11,460) (7,557)
Total revenues                   (11,830) (7,557)
Cost of sales                   (370) 0
Cost of transportation services                   (11,460) (7,557)
Operations and maintenance                   0 0
Depreciation and amortization                   0 0
General and administrative                   0 0
Taxes, other than income taxes                   0 0
Contract termination                   0  
(Gain) loss on disposal of assets                   0 0
Costs and Expenses                   (11,830) (7,557)
Operating income                   0 0
Interest expense, net                   0 0
Unrealized gain (loss) on derivative instrument                   0  
Equity in earnings of unconsolidated investments                   0 0
Other income, net                   0 0
Nonoperating Income (Expense)                   0 0
Net income before tax                   0 0
Deferred Income Tax Benefit (Expense)                   0 0
Net income                   0 0
Net income attributable to noncontrolling interests                   0 0
Net income (loss) attributable to TEGP                   $ 0 $ 0