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Other Current Liabilities - Schedule of Changes in Liability for Product Warranty Claims (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Other Liabilities Disclosure [Abstract]    
Balance at the beginning of the year $ 6,358 $ 6,672
Åkers - opening balance sheet liability for warranty claims 6,032 0
Satisfaction of warranty claims (558) (331)
Provision for warranty claims 613 748
Other, primarily impact from changes in foreign currency exchange rates 135 (153)
Balance at the end of the year $ 12,580 $ 6,936