Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Unrecognized Tax Benefits [Line Items]
Balance - Beginning of the year	$ 444	$ 851	$ 666
Gross increase - tax positions in prior periods		162	235
Gross decreases - tax positions in prior periods	(257)	(523)	(48)
Gross increases - current period tax positions	2	20
Lapse of statute of limitations		(66)	(2)
Balance - End of the year	$ 189	$ 444	$ 851