Components of Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Current:
Federal	$ 50	$ 6	$ 55	$ 13
State and local	22	18	52	35
Total Current	72	24	107	48
Deferred:
Federal
State and local
Total Deferred
Income tax expense	$ 72	$ 24	$ 107	$ 48
Effective income tax rate	13.50%	0.80%	6.00%	6.70%