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Recent Accounting Standards - Additional Information (Detail) - USD ($)
Jan. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Right-of-use assets   $ 85,538,000 $ 0  
Operating lease liabilities, Total   $ 113,026,000    
Capitalized cost amortization period   3 years    
ASU 2016-02        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Right-of-use assets $ 88,800,000      
Operating lease liabilities, Total 116,900,000      
Reductions in deferred rent 28,500,000      
Reductions in prepaid expenses 400,000      
Cumulative-effect adjustment to retained earnings $ 0      
ASU 2014-09        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Capitalized cost amortization period   3 years    
Accounting Standards Update No. 2016-16        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Cumulative-effect adjustment to retained earnings       $ 0