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Leases - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Jan. 01, 2019
Feb. 28, 2016
Total lease expense $ 7,200    
Variable lease costs 1,400    
Operating Lease, Right-of-Use Asset 50,733 $ 50,100 $ 50,100
Operating Lease, Liability $ 55,238 $ 54,300 $ 54,300
Operating Lease, Weighted Average Remaining Lease Term 4 years 2 months 12 days    
Operating Lease, Weighted Average Discount Rate, Percent 5.10%    
Short-term Lease, Cost $ 700