Commitments and Contingent Liabilities - Summary of Changes in Product Warranty/Liability Reserve (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Product Warranties Disclosures [Abstract]
Warranty reserve, beginning of year	$ 94,060	$ 101,507	$ 62,742
Provision	47,003	51,668	82,860
Payments	(53,656)	(59,115)	(44,095)
Warranty reserve, end of year	$ 87,407	$ 94,060	$ 101,507