Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization of intangibles	$ 37,000	$ 344,000	$ 90,000	$ 694,000
Estimated annual amortization expense in 2012	162,000		162,000
Estimated annual amortization expense in 2013	144,000		144,000
Estimated annual amortization expense in 2014	105,000		105,000
Estimated annual amortization expense in 2015	85,000		85,000
Estimated annual amortization expense thereafter	$ 75,000		$ 75,000