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Lease Commitments (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Leases [Abstract]      
2016 $ 6,838    
2017 6,130    
2018 5,663    
2019 5,246    
2020 4,821    
Thereafter 8,842    
Total future minimum rental commitments 37,540    
Rental expense $ 8,889 $ 8,056 $ 6,850