Segments - Additional information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information
Non-cash stock compensation	$ 931	$ 917	$ 1,249
General and Administrative Expenses [Member]
Segment Reporting Information
Non-cash stock compensation	$ 700	$ 700	$ 1,200