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Product Warranty Liabilities - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Product Warranty Liability [Line Items]        
Product warranty accrual reserve $ 12,839 $ 29,950 $ 14,005 $ 30,853
Additions to product warranty accrual reserve 7,106 13,983    
Product warranty accrual payments $ 8,272 14,886    
CCT Agreement [Member]        
Product Warranty Liability [Line Items]        
Product warranty accrual reserve       $ 16,807
Additions to product warranty accrual reserve   5,624    
Product warranty accrual payments   $ 6,976