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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 3 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 23, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2017 | Jun. 24, 2016 | Jan. 15, 2016 | Dec. 31, 2015 | Jun. 26, 2015 | Mar. 31, 2015
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating lease agreements expiration date |  |  |  | Various dates through 2025 |  |  |  |  |  |  |
Rental expense relating to operating leases | $ 7,769,000 | $ 8,488,000 |  | $ 15,753,000 | $ 17,359,000 |  |  |  |  |  |
Unfunded commitments for capital contributions | 5,132,000 |  |  | 5,132,000 |  |  |  |  |  |  |
Investment in private equity funds | 85,942,000 |  |  | 85,942,000 |  |  |  |  | $ 86,287,000 |  |
Other Commitment |  |  |  |  |  |  |  |  |  |  | $ 5,500,000
Loans and Leases Receivable, Gross |  | $ 3,500,000 |  |  | $ 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 | 23,527,000 |  |  | $ 23,527,000 |  |  |  |  | 26,473,000 |  |
Private Equity Funds [Member] | Discovery Fund [Member] |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment in private equity funds | 7,394,000 |  |  | 7,394,000 |  |  |  |  | $ 6,632,000 |  |
Private Equity Funds [Member] | Discovery Fund [Member] | Protego [Member] |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill | 9,653,000 |  |  | 9,653,000 |  |  |  |  |  |  |
Investment in private equity funds | 7,394,000 |  |  | $ 7,394,000 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Line Of Credit Facility, Termination Date |  |  |  | Jun. 23, 2016 |  |  |  |  |  |  |
PNC Bank [Member] |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 30,000,000 |  |  |  |
Line of Credit Facility, Expiration Date |  |  |  | Jun. 23, 2017 |  |  |  |  |  |  |
Other Assets [Member] |  |  |  |  |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 3,500,000 |  |  | $ 3,500,000 |  |  |  |  |  |  |

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