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Investments - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2010 | Feb. 28, 2010 | Dec. 31, 2008
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable Securities |  | $ 43,787,000 |  |  |  | $ 37,985,000 |  |  |  | $ 43,787,000 | $ 37,985,000 |  |  |  |  |
Unfunded commitments for capital contributions |  | 8,162,000 |  |  |  |  |  |  |  | 8,162,000 |  |  |  |  |  |
Participation in Successor Funds |  | 12,000,000 |  |  |  |  |  |  |  | 12,000,000 |  |  |  |  |  |
Net realized and unrealized gains (losses) on private equity fund investments, including performance fees |  |  |  |  |  |  |  |  |  | 5,086,000 | 7,858,000 | $ 8,060,000 |  |  |  |
Previously received carried interest subject to repayment |  | 0 |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Limited partnership investment |  | 0 |  |  |  | 4,014,000 |  |  |  | 0 | 4,014,000 |  |  |  |  |
Cost Method Investments |  |  |  | $ 1,079,000 |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from equity method investments |  | 2,016,000 | $ 929,000 | $ 1,998,000 | $ 1,107,000 | 1,799,000 | $ 1,102,000 | $ 2,038,000 | $ 241,000 | 6,050,000 | 5,180,000 | 8,326,000 |  |  |  |
Equity Method Investment |  | 86,287,000 |  |  |  | 76,581,000 |  |  |  | 86,287,000 | 76,581,000 |  |  |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  | 2,484,000 | 2,586,000 | 2,586,000 |  |  |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated assets |  | 31,100,000 |  |  |  | 10,487,000 |  |  |  | 31,100,000 | 10,487,000 |  |  |  |  |
Consolidated liabilities |  | $ 10,914,000 |  |  |  | 7,487,000 |  |  |  | $ 10,914,000 | 7,487,000 |  |  |  |  |
Atalanta Sosnoff [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partnership investment |  |  |  |  |  | 4,014,000 |  |  |  |  | 4,014,000 |  |  |  |  |
Equity method investment (as a percent) |  | 49.00% |  |  |  |  |  |  |  | 49.00% |  |  |  |  |  |
Equity Method Investment |  | $ 23,990,000 |  |  |  | 0 |  |  |  | $ 23,990,000 | 0 |  |  |  |  |
EMCP II [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner, Cash Distributions Paid |  |  |  |  |  |  |  |  |  | 3,194,000 |  |  |  |  |  |
Trilantic IV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner, Cash Distributions Paid |  |  |  |  |  |  |  |  |  | 2,907,000 |  |  |  |  |  |
EMP III [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated assets |  | 6,030,000 |  |  |  | 7,327,000 |  |  |  | 6,030,000 | 7,327,000 |  |  |  |  |
Consolidated liabilities |  | $ 164,000 |  |  |  | 75,000 |  |  |  | $ 164,000 | $ 75,000 |  |  |  |  |
Trilantic [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued LP Units (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 | 500,000 |
Limited partnership investment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,090,000 |  |
G5 Evercore [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment (as a percent) |  | 49.00% |  |  |  |  |  |  |  | 49.00% |  |  |  |  |  |
Equity interest issued or issuable (in shares) | 131,000 |  |  |  |  |  |  |  |  |  | 131,000 |  |  |  |  |
Equity interest issued or issuable, value | $ 7,232,000 |  |  |  |  |  |  | $ 7,232,000 |  |  |  |  |  |  |  |
Contingent consideration | $ 7,916,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from equity method investments |  |  |  |  |  |  |  |  |  | $ 662,000 | $ (48,000) | 2,126,000 |  |  |  |
Equity Method Investment |  | $ 20,730,000 |  |  |  | 32,756,000 |  |  |  | $ 20,730,000 | 32,756,000 |  |  |  |  |
ABS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment (as a percent) |  | 45.00% |  |  |  |  |  |  |  | 45.00% |  |  |  |  |  |
Income (loss) from equity method investments |  |  |  |  |  |  |  |  |  | $ 5,388,000 | 5,228,000 | 6,255,000 |  |  |  |
Equity Method Investment |  | $ 41,567,000 |  |  |  | 43,825,000 |  |  |  | 41,567,000 | 43,825,000 |  |  |  |  |
ECP II [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner, Cash Distributions Paid |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |  |
CSI Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner, Cash Distributions Paid |  |  |  |  |  |  |  |  |  | $ 2,909,000 |  |  |  |  |  |
Pan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from equity method investments |  |  |  |  |  |  |  |  |  |  |  | (55,000) |  |  |  |
Equity Method Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,158,000
Minimum [Member] | ECP II [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent ownership of carried interest |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |
Maximum [Member] | ECP II [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent ownership of carried interest |  |  |  |  |  |  |  |  |  | 9.00% |  |  |  |  |  |
EMCP III [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subscribed capital commitments |  |  |  |  |  |  |  |  |  |  |  | 201,000,000 |  |  |  |
EMCP III [Member] | EMP III [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitment |  |  |  |  |  |  |  |  |  |  |  | 10,750,000 |  |  |  |
Unfunded commitments for capital contributions |  | 4,665,000 |  |  |  |  |  |  |  | $ 4,665,000 |  |  |  |  |  |
EMCP III [Member] | Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitment |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |
Unfunded commitments for capital contributions |  | 391,000 |  |  |  |  |  |  |  | 391,000 |  |  |  |  |  |
EMCP III [Member] | Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitment |  |  |  |  |  |  |  |  |  |  |  | 9,750,000 |  |  |  |
Trilantic [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  | 12,812,000 |  |  |  | 13,455,000 |  |  |  | 12,812,000 | 13,455,000 |  |  |  |  |
Trilantic [Member] | Trilantic IV [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  | 8,000 |  |  |  |  |  |  |  | 8,000 |  | 29,000 | $ 1,091,000 |  |  |
Trilantic [Member] | Trilantic V [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitment |  | 5,000,000 |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |
Unfunded commitments for capital contributions |  | 3,246,000 |  |  |  |  |  |  |  | 3,246,000 |  |  |  |  |  |
Investment |  | 636,000 |  |  |  | 689,000 |  |  |  | 636,000 | 689,000 | $ 825,000 |  |  |  |
Private Equity Funds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  | 26,473,000 |  |  |  | 36,551,000 |  |  |  | 26,473,000 | 36,551,000 |  |  |  |  |
Private Equity Funds [Member] | ECP II [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | 748,000 |  |  |  |  |  |  |  | 748,000 |  |  |  |  |  |
Escrow Deposit |  | 87,000 |  |  |  |  |  |  |  | 87,000 |  |  |  |  |  |
Seller Note |  | 66,000 |  |  |  |  |  |  |  | 66,000 |  |  |  |  |  |
Marketable Securities |  | 82,000 |  |  |  |  |  |  |  | 82,000 |  |  |  |  |  |
Equity Method Investment |  | 983,000 |  |  |  | 4,043,000 |  |  |  | 983,000 | 4,043,000 |  |  |  |  |
Private Equity Funds [Member] | EMCP III [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  | 5,786,000 |  |  |  | 7,272,000 |  |  |  | 5,786,000 | 7,272,000 |  |  |  |  |
Private Equity Funds [Member] | Trilantic V [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  | $ 4,117,000 |  |  |  | $ 2,911,000 |  |  |  | $ 4,117,000 | $ 2,911,000 |  |  |  |  |

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