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Receivables - Receivables (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total $ 46,327   $ 39,278
Oil and Gas Joint Interest Billing Receivables 11,220   3,896
Allowance for bad debts (26)   (26)
Receivables, net 46,301   39,252
Loan secured by real estate [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 4,236   7,610
Notes receivable [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 8,234   7,987
Average interest rate 4.40% 5.00%  
Oil and gas revenue accrual receivable [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 18,753   8,137
Receivables and accrued interest [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total $ 3,884   $ 11,648