Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current income tax expense:
Federal	$ 511	$ 213	$ 298
State and local	(311)	(242)	638
Foreign	7,362	5,294	110
Total current income tax expense	7,562	5,265	1,046
Deferred income tax expense (benefit):
Federal	1,834	2,378	1,847
State and local	348	182	(284)
Foreign	(1,393)	(3,159)
Total deferred income tax expense	789	(599)	1,563
Total tax expense	$ 8,351	$ 4,666	$ 2,609