Income Taxes - Components of Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current expense:
Federal	$ 50,304	$ 48,025	$ 30,822
State	7,196	9,537	6,647
Foreign	4,052	2,765	2,407
Total current income tax expense	61,552	60,327	39,876
Deferred (benefit) expense:
Federal	(13,134)	(6,801)	(814)
State	(2,369)	(1,301)	90
Foreign	(661)	(471)	(1,076)
Total deferred income tax expense	(16,164)	(8,573)	(1,800)
Total income tax expense (benefit)	$ 45,388	$ 51,754	$ 38,076