Components of Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Current:
Federal	$ 5	$ 7
State and local	29	17
Total Current	34	24
Deferred:
Federal
State and local
Total Deferred
Income tax expense	$ 34	$ 24
Effective income tax rate	2.80%	0.60%