Commitments and Contingencies - Summary of Reconciliation of Company's Surface Flaking Warranty Reserve (Detail) - Surface Flaking Warranty Reserve [Member] - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Product Warranty Liability [Line Items]
Beginning balance	$ 31,419	$ 40,312
Changes in estimates related to pre-existing warranties	5,426
Settlements made during the period	(5,286)	(6,647)
Ending balance	$ 31,559	$ 33,665