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Commitments and Contingencies - Additional Information (Detail) (USD $) Share data in Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  |  |  |  |  | 1 Months Ended |  |  | 0 Months Ended
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Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Jun. 30, 2014 First Republic Bank [Member] | Jun. 30, 2014 First Republic Bank [Member] | Dec. 31, 2013 First Republic Bank [Member] | Jun. 30, 2014 Protego [Member] | Jun. 30, 2014 Private Equity Funds [Member] | Dec. 31, 2013 Private Equity Funds [Member] | Jun. 30, 2014 Private Equity Funds [Member] Discovery Fund [Member] | Dec. 31, 2013 Private Equity Funds [Member] Discovery Fund [Member] | Jun. 30, 2014 Private Equity Funds [Member] Discovery Fund [Member] Protego [Member] | Apr. 30, 2014 EWM [Member] | May 22, 2014 EWM [Member] | Aug. 03, 2014 Subsequent Event [Member] | Aug. 03, 2014 Subsequent Event [Member] Institutional Equities [Member] | Aug. 03, 2014 Subsequent Event [Member] Class E LP Units [Member] | Aug. 03, 2014 Subsequent Event [Member] Class G And H LP Units [Member]
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease agreements expiration date |  |  |  | Various dates through 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental expense relating to operating leases | $ 6,895,000 |  | $ 5,981,000 | $ 13,279,000 | $ 11,891,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Rent Expense, Minimum Rentals |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unfunded commitments for capital contributions | 9,882,000 |  |  | 9,882,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of the return proceeds received payable (as a percent) |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,243,000 |  |  |  |  |  |
Investment in private equity funds | 77,577,000 |  |  | 77,577,000 |  | 67,560,000 |  |  |  |  | 34,241,000 | 32,379,000 | 2,545,000 | 5,015,000 | 2,545,000 |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Initiation Date |  |  |  |  |  |  |  | Jun. 24, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  |  |  |  |  |  |  | Jun. 27, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount outstanding during period |  |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to purchase noncontrolling interest (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Commitment to purchase noncontrolling interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22.00% |  |  | 40.00% |  |
Purchase of interest by parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,100,000 |  |  |  |  |
Ownership Parent (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62.00% |  |  |  |
Business Acquisitions Contingent Consideration Potential Cash Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,000,000 |  |  |
Grant Of LP Units (in units) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 |  |  |  | 2,601 | 5,463

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- Definition Commitment To Purchase Noncontrolling Interest (as a percent) + References No definition available. + Details
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- Definition Commitment To Purchase Noncontrolling Interest (in shares) + References No definition available. + Details
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- Definition Unfunded commitments for capital contributions + References No definition available. + Details
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- Definition Represents the purchase by the parent of an additional equity interest in a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The purchase of the additional equity interest represented by this element increases the parent's controlling interest in the subsidiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4M -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4591554-111686 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Date the credit facility first became available, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum amount borrowed under the credit facility at any time during the period. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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- Definition This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7661868&loc=d3e34039-112682 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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