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Discontinued Operations - Components of Discontinued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenues and other income:                      
Natural gas, NGLs and oil sales $ 448,545 $ 431,214 $ 437,678 $ 398,239 $ 398,688 $ 337,040 $ 298,349 $ 317,617 $ 1,715,676 $ 1,351,694 $ 1,173,266
Gain on the sale of assets 3,162 6,008 83,287 (166) 61,836 949 (3,227) (10,426) 92,291 49,132 2,259
Total revenues and other income 428,086 442,038 673,356 319,239 458,038 299,780 448,931 250,955 1,862,719 1,457,704 1,230,642
Costs and expenses:                      
Direct operating 34,360 30,907 32,636 30,188 30,214 29,628 27,041 29,022 128,091 115,905 112,972
Transportation, gathering and compression 66,820 60,958 66,048 62,416 55,281 51,600 44,744 40,820 256,242 192,445 120,755
Production and ad valorem taxes 11,290 11,454 11,113 11,383 9,881 8,819 11,786 36,634 45,240 67,120 27,666
Exploration 14,065 20,496 13,068 16,780 18,022 14,752 15,517 21,516 64,409 69,807 81,367
Interest expense 44,955 44,321 45,071 42,210 44,708 43,997 42,888 37,205 176,557 168,798 125,052
Depletion, depreciation and amortization 126,958 130,343 119,995 115,101 113,216 123,059 108,802 100,151 492,397 445,228 341,221
Total costs and expenses 428,238 410,994 431,879 442,029 375,112 382,690 354,248 320,598 1,713,140 1,432,648 1,152,379
Income tax expense                      
Current (143)   (25) 25 (1,778)       (143) (1,778) 637
Deferred (28,180) 11,866 97,519 (47,205) 31,742 (29,074) 39,007 (27,843) 34,000 13,832 34,920
Total income tax (28,323) 11,866 97,494 (47,180) 29,964 (29,074) 39,007 (27,843) 33,857 12,054 35,557
Net income from discontinued operations                     15,320
Discontinued operations
                      
Revenues and other income:                      
Natural gas, NGLs and oil sales                     59,185
Gain on the sale of assets                     4,771
Other                     10
Total revenues and other income                     63,966
Costs and expenses:                      
Direct operating                     10,080
Transportation, gathering and compression                     5,257
Production and ad valorem taxes                     1,309
Exploration                     37
Interest expense                     14,791 [1]
Depletion, depreciation and amortization                     8,894
Total costs and expenses                     40,368
Income before income taxes                     23,598
Income tax expense                      
Current                       
Deferred                     8,278
Total income tax                     8,278
Net income from discontinued operations                     $ 15,320
[1] Interest expense is allocated to discontinued operations based on the ratio of net assets of discontinued operations to our consolidated net assets plus long-term debt.