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Income Taxes - Schedule of Provision for Income Tax Expense (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
Income Tax Disclosure [Abstract]
Current expense									$ 69,612us-gaap_CurrentIncomeTaxExpenseBenefit	$ 62,468us-gaap_CurrentIncomeTaxExpenseBenefit	$ 44,125us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred benefit									(24,955)us-gaap_DeferredIncomeTaxExpenseBenefit	(35,943)us-gaap_DeferredIncomeTaxExpenseBenefit	(7,527)us-gaap_DeferredIncomeTaxExpenseBenefit
Tax credits									(12,012)	(11,690)	(8,756)
Tax benefits attributable to items charged to equity and goodwill									2,105us-gaap_OtherTaxExpenseBenefit	1,034us-gaap_OtherTaxExpenseBenefit	654us-gaap_OtherTaxExpenseBenefit
Total income tax expense	$ 9,939us-gaap_IncomeTaxExpenseBenefit	$ 11,897us-gaap_IncomeTaxExpenseBenefit	$ 4,750us-gaap_IncomeTaxExpenseBenefit	$ 8,163us-gaap_IncomeTaxExpenseBenefit	$ 9,175us-gaap_IncomeTaxExpenseBenefit	$ 7,357us-gaap_IncomeTaxExpenseBenefit	$ 4,213us-gaap_IncomeTaxExpenseBenefit	$ (4,876)us-gaap_IncomeTaxExpenseBenefit	$ 34,750us-gaap_IncomeTaxExpenseBenefit	$ 15,869us-gaap_IncomeTaxExpenseBenefit	$ 28,496us-gaap_IncomeTaxExpenseBenefit

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

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