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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, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current income tax expense (benefit):
Federal and foreign									$ 28,084	$ 39,242	$ 573
State and local									446	146	340
Subtotal									28,530	39,388	913
Deferred income tax expense (benefit):
Federal and foreign									277	(11,414)	6,224
State and local
Subtotal									277	(11,414)	6,224
Income tax expense (benefit)	$ 6,076	$ 9,804	$ 6,284	$ 6,643	$ 13,243	$ 5,225	$ 6,225	$ 3,281	$ 28,807	$ 27,974	$ 7,137

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.