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Guarantees - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Guarantees [Abstract]    
Expiration dates of guarantees 2020  
Potential maximum exposure under these lease guarantees $ 1,000 $ 1,400
Liability representing fair value for estimated defaults of guarantees, based on discounted cash-flow analysis $ 5 $ 9