Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Non-cash investing and financing activities:
Purchase of property and equipment in accounts payable	$ 1,784	$ 574	$ 1,675
Additional cash payment information:
Interest paid	818	903	1,286
Income tax paid	$ 9,393	$ 146	$ 254