XML 77 R68.htm IDEA: XBRL DOCUMENT v2.4.0.6
Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Components Of Deferred Income Tax Assets And Liabilities [Line Items]    
Net operating loss carryforward $ 13,926 $ 13,110
Bonus and stock-based compensation 3,571 2,321
Derivative instruments   1,888
Total deferred tax assets 17,497 17,319
Oil and natural gas properties 191,271 107,069
Derivative instruments 8,455  
Total deferred tax liabilities 199,726 107,069
Total net deferred tax liability $ 182,229 $ 89,750