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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
counterparty
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
13 to 24 months [Member]
Dec. 31, 2013
25 to 36 months [Member]
Dec. 31, 2013
37 to 60 months [Member]
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
Building [Member]
Nov. 30, 2011
Barnett shale [Member]
Dec. 31, 2013
Proved oil and gas properties [Member]
Dec. 31, 2012
Proved oil and gas properties [Member]
Dec. 31, 2011
Proved oil and gas properties [Member]
Dec. 31, 2013
Unproved property leases [Member]
Dec. 31, 2012
Unproved property leases [Member]
Dec. 31, 2011
Unproved property leases [Member]
Dec. 31, 2013
Salt Water Disposal Facility [Member]
Dec. 31, 2013
Furniture and equipment [Member]
Minimum [Member]
Dec. 31, 2013
Furniture and equipment [Member]
Maximum [Member]
Dec. 31, 2013
Internal Revenue Service (IRS) [Member]
Dec. 31, 2013
State and Local Jurisdiction [Member]
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]                                          
Derivative, number of counterparties 6                                        
Proceeds from sale of property $ 0 $ 0 $ 2,202,000             $ 2,202,000                      
Gain (loss) on sale of properties 0 0 (207,000)             (207,000)                      
Impairment of oil and gas properties 1,168,000 3,581,000 3,610,000               0 0 0 1,200,000 3,600,000 3,600,000          
Capitalized interest costs 4,600,000 3,300,000 3,100,000                                    
Estimated life of assets                 20 years               30 years 2 years 7 years    
Past-due receivables from counterparties 0                                        
Contractual commodity derivative volume, percent 110.00%     100.00% 75.00% 50.00%                              
Restricted stock awards vesting period 3 years                                        
Annual Forfeiture Rate             0.00% 11.00%                          
Stock-based compensation related to unrealized excess tax benefits                                       $ 4,800,000 $ 3,500,000