Operating Lease - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Leases [Abstract]
Operating lease expense	$ 945	$ 1,013	$ 813
Operating lease payments, in 2014	842
Operating lease payments, in 2015	519
Operating lease payments, in 2016	162
Operating lease payments, in 2017	81
Operating lease payments, in 2018	17
Operating lease payments, thereafter	$ 0