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Consolidated Income Tax Expense (benefit) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current
Federal	$ 19,036us-gaap_CurrentFederalTaxExpenseBenefit	$ 197us-gaap_CurrentFederalTaxExpenseBenefit	$ 0us-gaap_CurrentFederalTaxExpenseBenefit
State	1,805us-gaap_CurrentStateAndLocalTaxExpenseBenefit	717us-gaap_CurrentStateAndLocalTaxExpenseBenefit	174us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign	118us-gaap_CurrentForeignTaxExpenseBenefit	130us-gaap_CurrentForeignTaxExpenseBenefit	141us-gaap_CurrentForeignTaxExpenseBenefit
Current, Total	20,959us-gaap_CurrentIncomeTaxExpenseBenefit	1,044us-gaap_CurrentIncomeTaxExpenseBenefit	315us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred
Federal	12,913us-gaap_DeferredFederalIncomeTaxExpenseBenefit	26,753us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(46,378)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State	3,778us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	3,412us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(10,871)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign	(118)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(115)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(34)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred, Total	16,573us-gaap_DeferredIncomeTaxExpenseBenefit	30,089us-gaap_DeferredIncomeTaxExpenseBenefit	(57,283)us-gaap_DeferredIncomeTaxExpenseBenefit
Total consolidated expense (benefit)	$ 37,532us-gaap_IncomeTaxExpenseBenefit	$ 31,094us-gaap_IncomeTaxExpenseBenefit	$ (56,968)us-gaap_IncomeTaxExpenseBenefit

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