Background - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands			12 Months Ended
	Apr. 11, 2013	Mar. 27, 2013	Dec. 31, 2015
Background And Basis Of Presentation [Line Items]
Incorporation date			Mar. 31, 2006
Common stock shares sold	1,125
Gross proceeds from IPO		$ 105,000
Net proceeds from shares issuance in IPO	$ 14,648
Initial Public Offering [Member]
Background And Basis Of Presentation [Line Items]
Common stock shares sold		7,500
Public offering price per share		$ 14.00
Net proceeds from IPO		$ 94,659