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Business Segment Information - Summarized Financial Information of Segments (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
Segment Reporting Information [Line Items]                      
Total revenues $ 333,615 $ 305,498 $ 254,582 $ 248,304 $ 214,327 $ 184,710 $ 149,063 $ 138,566 $ 1,141,999 $ 686,668 $ 330,422
Operating income 122,133 150,862 113,450 117,953 86,619 72,038 60,184 58,152 504,398 276,993 152,567
Other income (expense)                 (141,381) (31,119) (26,388)
Income before income taxes                 363,017 245,874 126,179
Total assets 4,711,924       2,528,794       4,711,924 2,528,794  
Depreciation, depletion and amortization                 307,055 206,734 74,981
Exploration and Production [Member]
                      
Segment Reporting Information [Line Items]                      
Total revenues                 1,084,412 670,491  
Well Services [Member]
                      
Segment Reporting Information [Line Items]                      
Total revenues                 51,845 16,177  
Midstream Services [Member]
                      
Segment Reporting Information [Line Items]                      
Total revenues                 5,742    
Operating Segments [Member]
                      
Segment Reporting Information [Line Items]                      
Total revenues                 1,294,328 752,972  
Operating income                 504,398 276,993  
Other income (expense)                 (141,381) (31,119)  
Income before income taxes                 363,017 245,874  
Total assets 4,711,924       2,528,794       4,711,924 2,528,794  
Capital expenditures                 2,506,298 1,148,573  
Depreciation, depletion and amortization                 307,055 206,734  
Operating Segments [Member] | Exploration and Production [Member]
                      
Segment Reporting Information [Line Items]                      
Total revenues                 1,084,412 670,491  
Operating income                 486,697 276,740  
Other income (expense)                 (141,397) (31,120)  
Income before income taxes                 345,300 245,620  
Total assets 4,532,264       2,475,820       4,532,264 2,475,820  
Capital expenditures                 2,472,126 1,132,894  
Depreciation, depletion and amortization                 304,389 206,127  
Operating Segments [Member] | Well Services [Member]
                      
Segment Reporting Information [Line Items]                      
Total revenues                 180,686 82,481  
Operating income                 14,305 253  
Other income (expense)                 16 1  
Income before income taxes                 14,321 254  
Total assets 70,708       52,974       70,708 52,974  
Capital expenditures                 15,217 15,679  
Depreciation, depletion and amortization                 2,091 607  
Operating Segments [Member] | Midstream Services [Member]
                      
Segment Reporting Information [Line Items]                      
Total revenues                 29,230    
Operating income                 3,396    
Income before income taxes                 3,396    
Total assets 108,952               108,952    
Capital expenditures                 18,955    
Depreciation, depletion and amortization                 575    
Intersegment Eliminations [Member]
                      
Segment Reporting Information [Line Items]                      
Total revenues                 (152,329) (66,304)  
Intersegment Eliminations [Member] | Well Services [Member]
                      
Segment Reporting Information [Line Items]                      
Total revenues                 (128,841) (66,304)  
Intersegment Eliminations [Member] | Midstream Services [Member]
                      
Segment Reporting Information [Line Items]                      
Total revenues                 $ (23,488)