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Summary of Significant Accounting Policies - Summary of Accrued Warranty Obligation (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]      
Balance at the beginning of the year $ 4,125us-gaap_ProductWarrantyAccrual $ 4,252us-gaap_ProductWarrantyAccrual $ 4,613us-gaap_ProductWarrantyAccrual
Acquisition 20,501us-gaap_ProductWarrantyAccrualAdditionsFromBusinessAcquisition 0us-gaap_ProductWarrantyAccrualAdditionsFromBusinessAcquisition 0us-gaap_ProductWarrantyAccrualAdditionsFromBusinessAcquisition
Warranty expense 12,909us-gaap_ProductWarrantyExpense 7,440us-gaap_ProductWarrantyExpense 6,828us-gaap_ProductWarrantyExpense
Warranty payments (12,869)us-gaap_ProductWarrantyAccrualPayments (7,567)us-gaap_ProductWarrantyAccrualPayments (7,189)us-gaap_ProductWarrantyAccrualPayments
Balance at the end of the period $ 24,666us-gaap_ProductWarrantyAccrual $ 4,125us-gaap_ProductWarrantyAccrual $ 4,252us-gaap_ProductWarrantyAccrual