Revenues from Major Customers - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013 Customer	Dec. 31, 2012 Customer	Dec. 31, 2011
Concentration Risk [Line Items]
Number of major customer									1	1
Net revenues	$ 31,851	$ 34,044	$ 32,605	$ 33,493	$ 28,497	$ 30,637	$ 30,689	$ 29,239	$ 131,993	$ 119,062	$ 117,704
Major Customer | Revenue
Concentration Risk [Line Items]
Net revenues									$ 13,500	$ 15,100
Percentage of net revenue									10.20%	12.90%