Revolving Line of Credit - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Mar. 03, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Debt Disclosure [Abstract]
Line of credit facility, maximum borrowing capacity			$ 50,000,000
Interest rate, description			LIBOR plus 3%
Line of credit facility basis spread on variable rate			3.00%
Line of credit facility, expiration date			Mar. 03, 2014
Line of credit facility, extended maturity date			Mar. 03, 2015
Line of credit facility, amount outstanding					0
Line of credit facility, commitment fee amount	$ 29,000	$ 44,000		$ 87,000