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Basis of Presentation - Additional Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets $ 32,423    
Operating lease liabilities $ 32,424    
Cumulative effect of accounting change   $ (700) $ 670
Accounting Standards Update 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets   34,900  
Operating lease liabilities   34,400  
Retained Earnings      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of accounting change   (700) $ 670
Retained Earnings | Accounting Standards Update 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of accounting change   $ (700)