Reconciliations of Total Amount of Gross Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Schedule of Unrecognized Tax Benefits [Line Items]
Gross unrecognized tax benefits at beginning of year	$ 5,419	$ 2,467
Increases in tax positions for prior years	28	0
Decreases in tax positions for prior years	0	(19)
Increases in tax positions for current year	1,879	4,608
Settlements	(2,298)	(1,044)
Lapse in statute of limitations	(751)	(593)
Gross unrecognized tax benefits at end of year	$ 4,277	$ 5,419