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Components of Current and Deferred Income Tax Expense (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current income tax expense (benefit):
Federal and foreign									$ 27,290	$ 23,703	$ 39,242
State and local									1,036	446	146
Subtotal									28,326us-gaap_CurrentIncomeTaxExpenseBenefit	24,149us-gaap_CurrentIncomeTaxExpenseBenefit	39,388us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense (benefit):
Federal and foreign									16,881	4,658	(11,414)
State and local									0	0	0
Subtotal									16,881us-gaap_DeferredIncomeTaxExpenseBenefit	4,658us-gaap_DeferredIncomeTaxExpenseBenefit	(11,414)us-gaap_DeferredIncomeTaxExpenseBenefit
Actual tax expense and rate	$ 8,823us-gaap_IncomeTaxExpenseBenefit	$ 15,032us-gaap_IncomeTaxExpenseBenefit	$ 7,998us-gaap_IncomeTaxExpenseBenefit	$ 13,354us-gaap_IncomeTaxExpenseBenefit	$ 6,076us-gaap_IncomeTaxExpenseBenefit	$ 9,804us-gaap_IncomeTaxExpenseBenefit	$ 6,284us-gaap_IncomeTaxExpenseBenefit	$ 6,643us-gaap_IncomeTaxExpenseBenefit	$ 45,207us-gaap_IncomeTaxExpenseBenefit	$ 28,807us-gaap_IncomeTaxExpenseBenefit	$ 27,974us-gaap_IncomeTaxExpenseBenefit

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.

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