Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Income Taxes Reconciliation Of Unrecognized Tax Benefits [Abstract]
Balance, Unrecognized tax benefits	$ 7,077	$ 4,994	$ 3,912
Additions based on tax provisions related to the current year	1,337	1,870	524
Additions based on tax provisions related to the prior year	15,249	716	1,010
Deductions based on settlement/expiration of prior year tax positions	(2,062)	(503)	(452)
Balance, Unrecognized tax benefits	$ 21,601	$ 7,077	$ 4,994