Commitments and Contingencies - Summary of Reconciliation of Company's Warranty Reserve that Represents Amounts Accrued for Surface Flaking Claims (Detail) - Surface Flaking Warranty Reserve [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Product Warranty Liability [Line Items]
Beginning balance	$ 33,847	$ 29,673
Changes in estimates related to pre-existing warranties	0	0
Settlements made during the period	(1,114)	(1,074)
Ending balance	$ 32,733	$ 28,599