Income Taxes - Schedule of Gross Unrecognized Tax Benefits (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Beginning balance, interest and penalties	$ 12,200	$ 14,799	$ 8,454	$ 7,099
Ending balance, interest and penalties	$ 12,200	$ 14,799	$ 8,454	$ 7,099