Revolving Line of Credit - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 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		0
Line of credit facility, commitment fee amount	$ 29,000	$ 43,000