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Product Warranties - Change in Accrued Warranty Expense (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Product Warranties Disclosures [Abstract]        
Beginning balance $ 930 $ 585 $ 531 $ 431
Provision 60 52 131 263
Payments (102) (25) (214) (82)
Acquisition 112   552  
Ending balance $ 1,000 $ 612 $ 1,000 $ 612