Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 40,244	$ 45,049
Additions based on tax positions related to the current year	5,618	4,185
Reductions for tax positions of prior years	(2,066)	(8,928)
Settlements		(62)
Balance at end of year	$ 43,796	$ 40,244