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Recent Accounting Standards - Additional Information (Detail) - USD ($)
Jan. 01, 2019
Jun. 30, 2019
Dec. 31, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Right-of-use assets   $ 89,631,000 $ 0
Operating lease liabilities, Total   $ 117,447,000  
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