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Leases - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jan. 01, 2019
Feb. 28, 2016
Total lease expense $ 8,900 $ 17,100    
Variable lease costs 2,600 5,000    
Operating Lease, Right-of-Use Asset 56,315 56,315 $ 50,100 $ 50,100
Operating Lease, Liability $ 64,501 $ 64,501 $ 54,300 $ 54,300
Operating Lease, Weighted Average Remaining Lease Term 4 years 8 months 12 days 4 years 8 months 12 days    
Operating Lease, Weighted Average Discount Rate, Percent 5.20% 5.20%    
Short-term Lease, Cost $ 800 $ 1,500