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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2015 | Jan. 15, 2016 | Jun. 26, 2015
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Operating lease agreements expiration date |  | Various dates through 2025 |  |  |  |  |
Rental expense relating to operating leases |  | $ 7,985,000 | $ 8,871,000 |  |  |  |
Unfunded commitments for capital contributions | $ 5,610,000 | 5,610,000 |  |  |  |  |
Investment in private equity funds | 83,669,000 | 83,669,000 |  |  | $ 86,287,000 |  |
Other Commitment |  |  | 5,500,000 |  |  |  |
Loans and Leases Receivable, Gross |  |  | $ 3,500,000 |  |  |  |
Remaining Loan Commitment | 2,000,000 | $ 2,000,000 |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  |  |  | 300,000,000 |  |
Protego [Member] |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Percentage of the return proceeds received payable (as a percent) |  | 90.00% |  |  |  |  |
Private Equity Funds [Member] |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Investment in private equity funds | 27,578,000 | $ 27,578,000 |  |  | 26,473,000 |  |
Private Equity Funds [Member] | Discovery Fund [Member] |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Investment in private equity funds | 6,928,000 | 6,928,000 |  |  | $ 6,632,000 |  |
Private Equity Funds [Member] | Discovery Fund [Member] | Protego [Member] |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Goodwill | 4,722,000 | 4,722,000 |  |  |  |  |
Investment in private equity funds | 6,928,000 | $ 6,928,000 |  |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions |  |  |  | 20.00% |  |  |
First Republic Bank [Member] |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 50,000,000 | $ 75,000,000
Line of Credit Facility, Expiration Date |  | Jun. 27, 2016 |  |  |  |  |
Amount outstanding during period | $ 50,000,000 |  |  |  |  |  |

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