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Commitments and Contingencies - Additional Information (Details)
shares in Thousands, ¥ in Billions
 2 Months Ended 3 Months Ended 9 Months Ended
Jul. 01, 2018
ft²
Floor
Mar. 02, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
JPY (¥)
Jun. 24, 2016
USD ($)
Jul. 31, 2015
USD ($)
shares
Other Commitments [Line Items]                    
Rental Expense Relating to Operating Leases     $ 11,470,000 $ 9,905,000 $ 32,042,000 $ 29,793,000        
Additional Floors | Floor 7                  
Additional Floors Commencing on Lease Effective Date | Floor 3                  
Time to Take Possession of Additional Floors 5 years                  
Square Feet of Office Space | ft² 350,000                  
Unfunded Commitments for Capital Contributions     3,294,000   $ 3,294,000          
Underwritten Shares (in shares) | shares                   294
Aggregate Offering Price                   $ 30,800,000
Inter-Bank Balance Interest Rate [Member]                    
Other Commitments [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate         0.10%          
Foreign Exchange Forward [Member]                    
Other Commitments [Line Items]                    
Derivative Asset, Notional Amount             $ 20,136,000 ¥ 2.2    
PNC Bank [Member]                    
Other Commitments [Line Items]                    
Maximum Borrowing Capacity                 $ 30,000,000  
Amount Outstanding During Period   $ 30,000,000                
BBVA Bancomer [Member]                    
Other Commitments [Line Items]                    
Maximum Borrowing Capacity     $ 10,604,000   $ 10,604,000