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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 |  |  |  |  |

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