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Summary of Significant Accounting Policies - Reconciliation of Reserve for Warranty Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]      
Beginning balance $ 5,607 $ 6,406 $ 7,539
Provision 5,220 4,724 5,177
Claims paid/costs incurred (5,121) (5,523) (6,310)
Ending balance $ 5,706 $ 5,607 $ 6,406