Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.19.3
Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items]    
Operating lease right-of-use assets $ 56,800 $ 65,000
Operating lease liability $ 64,534 $ 74,400
Minimum [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Agreement termination notice period 10 days  
Maximum [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Agreement termination notice period 30 days