Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Accrued compensation	$ 17,259	$ 15,455
Accrued income tax and sales tax	1,161	332
Customer deposits	3,798	3,204
Provision for forward loss reserves	2,025	4,780
Other	5,556	5,508
Total	$ 29,799	$ 29,279