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Income Taxes - Differences between Total Income Tax Expense and Income Tax Expense (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Computed “expected” Federal income tax expense $ 53,415us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 42,304us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 45,614us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increase (decrease) in income taxes resulting from:      
State income taxes, net 8,118us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 3,138us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 5,551us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Foreign non-taxed income, rate differential (5,453)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (2,647)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (481)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Other adjustments, net (3,355)us-gaap_IncomeTaxReconciliationOtherAdjustments 2,593us-gaap_IncomeTaxReconciliationOtherAdjustments 1,070us-gaap_IncomeTaxReconciliationOtherAdjustments
Total income tax expense (benefit) $ 52,725us-gaap_IncomeTaxExpenseBenefit $ 45,388us-gaap_IncomeTaxExpenseBenefit $ 51,754us-gaap_IncomeTaxExpenseBenefit