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Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Balance Sheet) (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
ASSETS        
Cash and cash equivalents $ 238,886 $ 470,872 $ 300,005 $ 143,520
Short-term investments   19,994    
Accounts receivable - oil and gas revenues 79,478 52,164    
Accounts receivable - joint interest partners 66,794 67,268    
Inventory 19,550 3,543    
Prepaid expenses 674 2,140    
Advances to joint interest partners 1,957 3,935    
Deferred income taxes   3,233    
Derivative instruments 35,257      
Other current assets 1 491    
Total current assets 442,597 623,640    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 1,769,570 1,235,357    
Other property and equipment 41,333 20,859    
Less: accumulated depreciation, depletion, amortization and impairment (261,529) (176,261)    
Total property, plant and equipment, net 1,549,374 1,079,955    
Derivative instruments 18,167 4,362    
Deferred costs and other assets 26,232 19,425    
Total assets 2,036,370 1,727,382    
LIABILITIES AND STOCKHOLDERS' EQUITY        
Accounts payable 1,010 12,207    
Advances from joint interest partners 28,444 9,064    
Revenues and production taxes payable 56,795 19,468    
Accrued liabilities 237,694 119,692    
Accrued interest payable 16,427 15,774    
Derivative instruments   5,907    
Deferred income taxes 11,780      
Other current liabilities 2,895 472    
Total current liabilities 355,045 182,584    
Long-term debt 800,000 800,000    
Asset retirement obligations 16,982 13,075    
Derivative instruments   3,505    
Deferred income taxes 133,178 92,983    
Other liabilities 1,751 997    
Total liabilities 1,306,956 1,093,144    
Stockholders' equity        
Common stock, $0.01 par value; 300,000,000 shares authorized; 92,483,393 issued and 92,460,914 outstanding 922 921    
Treasury stock, at cost; 22,479 shares (1,808) (602)    
Additional paid-in-capital 651,271 647,374    
Retained earnings 79,029 (13,455)    
Total stockholders' equity 729,414 634,238    
Total liabilities and stockholders' equity 2,036,370 1,727,382    
Parent/Issuer [Member]
        
ASSETS        
Cash and cash equivalents 195,660 443,482 274,763 119,940
Short-term investments   19,994    
Accounts receivable - from affiliates 266 88    
Prepaid expenses 63 309    
Other current assets 1 18    
Total current assets 195,990 463,891    
Property, plant and equipment        
Investments in and advances to subsidiaries 1,313,402 958,880    
Deferred income taxes 24,980 13,158    
Deferred costs and other assets 22,132 15,742    
Total assets 1,556,504 1,451,671    
LIABILITIES AND STOCKHOLDERS' EQUITY        
Accounts payable   23    
Accounts payable - from affiliates 3,361 1,540    
Accrued liabilities 7,312 103    
Accrued interest payable 16,417 15,767    
Total current liabilities 27,090 17,433    
Long-term debt 800,000 800,000    
Total liabilities 827,090 817,433    
Stockholders' equity        
Common stock, $0.01 par value; 300,000,000 shares authorized; 92,483,393 issued and 92,460,914 outstanding 922 921    
Treasury stock, at cost; 22,479 shares (1,808) (602)    
Additional paid-in-capital 651,271 647,374    
Retained earnings 79,029 (13,455)    
Total stockholders' equity 729,414 634,238    
Total liabilities and stockholders' equity 1,556,504 1,451,671    
Combined Guarantor Subsidiaries [Member]
        
ASSETS        
Cash and cash equivalents 43,226 27,390 25,242 23,580
Accounts receivable - oil and gas revenues 79,478 52,164    
Accounts receivable - joint interest partners 66,794 67,268    
Accounts receivable - from affiliates 3,361 1,540    
Inventory 19,550 3,543    
Prepaid expenses 611 1,831    
Advances to joint interest partners 1,957 3,935    
Deferred income taxes   3,233    
Derivative instruments 35,257      
Other current assets   473    
Total current assets 250,234 161,377    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 1,769,570 1,235,357    
Other property and equipment 41,333 20,859    
Less: accumulated depreciation, depletion, amortization and impairment (261,529) (176,261)    
Total property, plant and equipment, net 1,549,374 1,079,955    
Derivative instruments 18,167 4,362    
Deferred costs and other assets 4,100 3,683    
Total assets 1,821,875 1,249,377    
LIABILITIES AND STOCKHOLDERS' EQUITY        
Accounts payable 1,010 12,184    
Accounts payable - from affiliates 266 88    
Advances from joint interest partners 28,444 9,064    
Revenues and production taxes payable 56,795 19,468    
Accrued liabilities 230,382 119,589    
Accrued interest payable 10 7    
Derivative instruments   5,907    
Deferred income taxes 11,780      
Other current liabilities 2,895 472    
Total current liabilities 331,582 166,779    
Asset retirement obligations 16,982 13,075    
Derivative instruments   3,505    
Deferred income taxes 158,158 106,141    
Other liabilities 1,751 997    
Total liabilities 508,473 290,497    
Stockholders' equity        
Capital contributions from affiliates 1,183,810 941,575    
Additional paid-in-capital 8,743 8,743    
Retained earnings 120,849 8,562    
Total stockholders' equity 1,313,402 958,880    
Total liabilities and stockholders' equity 1,821,875 1,249,377    
Intercompany Eliminations [Member]
        
ASSETS        
Accounts receivable - from affiliates (3,627) (1,628)    
Total current assets (3,627) (1,628)    
Property, plant and equipment        
Investments in and advances to subsidiaries (1,313,402) (958,880)    
Deferred income taxes (24,980) (13,158)    
Total assets (1,342,009) (973,666)    
LIABILITIES AND STOCKHOLDERS' EQUITY        
Accounts payable - from affiliates (3,627) (1,628)    
Total current liabilities (3,627) (1,628)    
Deferred income taxes (24,980) (13,158)    
Total liabilities (28,607) (14,786)    
Stockholders' equity        
Capital contributions from affiliates (1,183,810) (941,575)    
Additional paid-in-capital (8,743) (8,743)    
Retained earnings (120,849) (8,562)    
Total stockholders' equity (1,313,402) (958,880)    
Total liabilities and stockholders' equity $ (1,342,009) $ (973,666)