Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Current:
Federal	$ 1,846	$ 0
State and local	585	51
Current income tax expense (benefit)	2,431	51
Deferred:
Federal	(927)	522
State and local	(109)	61
Deferred income tax expense (benefit)	(1,036)	583
Provision for income taxes	$ 1,395	$ 634