Reconciliation of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Balance at beginning of period	$ 40,516	$ 31,664	$ 26,412
Increases based on tax positions taken in the current year	539	10,830	8,197
Increases based on tax positions taken in prior years	3,831	158	2,590
Decreases based on tax positions taken in prior years	(3,688)	(1,465)	(473)
Decreases due to settlements with tax authorities			(2,697)
Decreases due to lapse of applicable statute of limitation	(585)	(671)	(2,365)
Balance at end of period	$ 40,613	$ 40,516	$ 31,664