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	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Product Warranty Liability [Line Items]
Beginning balance	$ 33,847	$ 29,673
Changes in estimates related to pre-existing warranties		9,835
Settlements made during the period	(4,425)	(4,188)
Ending balance	$ 29,422	$ 35,320