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Commitments and Contingencies- Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Feb. 12, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating And Capital Leased Assets [Line Items]        
Increase in future lease commitments   $ 84,200    
Improvement reimbursements from landlords   12,800    
Rent expense   23,100 $ 18,900 $ 13,800
Deferred rent, net of current portion   27,000 $ 19,000  
Rent payable   $ 352,279    
Subsequent Event [Member] | Lease Commencement, April 2019 [Member]        
Operating And Capital Leased Assets [Line Items]        
Lease agreement period 3 years      
Lease commencement date 2019-04      
Rent payable $ 1,700