Income Taxes - Additional Information (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
Income Tax Disclosure [Abstract]
Tax expense	$ 140	$ 131	$ 219	$ 219
Effective tax rate	9.00%	49.40%	29.40%	41.50%
Interest and penalties	22	21	43	43
Unrecognized tax benefits	$ 140		$ 140