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Leases - (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Lease terms      
Option to extend P20Y    
Weighted-average remaining lease term 9 years   10 years
Weighted-average discount rate 4.90%   4.90%
Lease expense      
Operating lease expense $ 6,396 $ 5,227  
Variable lease expense 1,292 1,173  
Rent expense $ 7,688 $ 6,400  
Weighted-average remaining lease term 9 years   10 years
Minimum      
Lease terms      
Remaining lease terms 1 year    
Maximum      
Lease terms      
Remaining lease terms 11 years