Goodwill and Intangible Assets - 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
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense of finite life intangible assets	$ 591	$ 76	$ 750	$ 172
Amortization expense of finite life intangibles for 2013	700		700
Amortization expense of finite life intangibles for 2014	1,750		1,750
Amortization expense of finite life intangibles for 2015	1,630		1,630
Amortization expense of finite life intangibles for 2016	1,405		1,405
Amortization expense of finite life intangibles for 2017	$ 1,263		$ 1,263