Accrued Liabilities - Summary of Accrued Warranty Obligations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Payables And Accruals [Abstract]
Balance at January 1,	$ 1,470	$ 2,199
Warranty liabilities assumed from acquisitions	450	96
Amortization of fair value adjustment of warranty liabilities acquired through acquisitions	(12)	(164)	$ (47)
Reduction of warranty liabilities assumed in connection with acquisitions	(174)	(720)
Warranty expense	827	692
Warranty charges	(240)	(633)
Balance at December 31,	$ 2,321	$ 1,470	$ 2,199