Significant Accounting Policies - Summary of Activity in Product Warranty Liabilities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Product Warranties Disclosures [Abstract]
Reserve at beginning of year	$ 12,339	$ 14,005	$ 30,853
Additions	8,349	9,122	17,413
Payments	(10,054)	(10,788)	(19,112)
Decrease due to sale of interest in subsidiary	0	0	(15,149)
Reserve at end of year	$ 10,634	$ 12,339	$ 14,005