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Reconciliation of Differences from U.S. Federal Statutory Rate (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Expenses [Line Items]
Pretax book income		$ 98,462us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	$ 77,623us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	$ 48,663us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Federal tax expense at 35% statutory rate		34,462us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	27,168us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	17,032us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State and local income taxes		4,808us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	3,870us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	2,619us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Foreign tax rate differential		(206)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(41)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(14)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Benefit of domestic production deduction		(2,010)us-gaap_IncomeTaxReconciliationDeductions	0us-gaap_IncomeTaxReconciliationDeductions	0us-gaap_IncomeTaxReconciliationDeductions
Reversal of income tax valuation allowance against net deferred tax assets	(59,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount	0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount	0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount	(59,887)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Utilization of valuation allowance for net operating losses and credit carrryforwards - U.S. and states		(132)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(19,528)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other		610us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther	97us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther	2,810us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Total income tax expense (benefit)		$ 37,532us-gaap_IncomeTaxExpenseBenefit	$ 31,094us-gaap_IncomeTaxExpenseBenefit	$ (56,968)us-gaap_IncomeTaxExpenseBenefit

X

- Definition

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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