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Significant Components of Provision for Income Taxes (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 11,310,000us-gaap_CurrentFederalTaxExpenseBenefit	$ 27,188,000us-gaap_CurrentFederalTaxExpenseBenefit	$ 37,596,000us-gaap_CurrentFederalTaxExpenseBenefit
State	500,000	2,164,000	2,268,000
Foreign	1,084,000us-gaap_CurrentForeignTaxExpenseBenefit	842,000us-gaap_CurrentForeignTaxExpenseBenefit	1,581,000us-gaap_CurrentForeignTaxExpenseBenefit
Total current	12,894,000us-gaap_CurrentIncomeTaxExpenseBenefit	30,194,000us-gaap_CurrentIncomeTaxExpenseBenefit	41,445,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred	24,389,000us-gaap_DeferredIncomeTaxExpenseBenefit	10,121,000us-gaap_DeferredIncomeTaxExpenseBenefit	11,212,000us-gaap_DeferredIncomeTaxExpenseBenefit
Income taxes	37,283,000us-gaap_IncomeTaxExpenseBenefit	40,315,000us-gaap_IncomeTaxExpenseBenefit	52,657,000us-gaap_IncomeTaxExpenseBenefit
Deferred Income Taxes
Current:
Deferred	$ 24,389,000	$ 10,121,000	$ 11,212,000

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.