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Commitments and Contingencies - Additional Information (Detail) - USD ($)	3 Months Ended		5 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Jun. 23, 2016	Sep. 30, 2016	Sep. 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]
Rental expense relating to operating leases	$ 9,311,000	$ 8,345,000		$ 25,065,000	$ 25,704,000
Unfunded commitments for capital contributions	5,134,000			5,134,000
Investment in private equity funds	86,532,000			86,532,000					$ 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%
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
Amount outstanding during period			$ 50,000,000
PNC Bank [Member]
Commitment And Contingencies [Line Items]
Maximum borrowing capacity							$ 30,000,000
Other Assets [Member]
Commitment And Contingencies [Line Items]
Loans and Leases Receivable, Gross	3,500,000			$ 3,500,000
Private Equity Funds [Member]
Commitment And Contingencies [Line Items]
Investment in private equity funds	19,880,000			19,880,000					26,473,000
Private Equity Funds [Member] | Discovery Fund [Member]
Commitment And Contingencies [Line Items]
Investment in private equity funds	7,459,000			7,459,000					$ 6,632,000
Private Equity Funds [Member] | Discovery Fund [Member] | Protego [Member]
Commitment And Contingencies [Line Items]
Goodwill	10,150,000			10,150,000
Investment in private equity funds	$ 7,459,000			$ 7,459,000

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Business Combinations, Percentage of the Return Proceeds Received Payable

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Remaining Loan Commitment

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Unfunded commitments for capital contributions

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

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Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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