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Guarantees - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Guarantees [Abstract]    
Expiration dates of guarantees 2020  
Potential maximum exposure under these lease guarantees $ 1,400 $ 10,300
Liability representing fair value for estimated defaults of guarantees, based on discounted cash-flow analysis $ 9 $ 100