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Investments - Additional Information (Detail) - USD ($) | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2010
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment | $ 83,669,000 |  | $ 86,287,000 |  |  |  |  |
Marketable Securities | 46,865,000 |  | 43,787,000 |  |  |  |  |
Unfunded commitments for capital contributions | 5,610,000 |  |  |  |  |  |  |
Net realized and unrealized gains (losses) on private equity fund investments, including performance fees | 1,367,000 | $ (489,000) |  |  |  |  |  |
Previously received carried interest subject to repayment | 0 |  |  |  |  |  |  |
Participation in Successor Funds | 12,000,000 |  |  |  |  |  |  |
Cost Method Investments |  |  |  | $ 1,079,000 |  |  |  |
Income (loss) from equity method investments | 1,287,000 | 1,107,000 |  |  |  |  |  |
Amortization of intangible assets | 880,000 | 621,000 |  |  |  |  |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Consolidated assets | 97,962,000 |  | 151,583,000 |  |  |  |  |
Consolidated liabilities | 66,543,000 |  | 110,424,000 |  |  |  |  |
Atalanta Sosnoff [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment | $ 23,713,000 |  | 23,990,000 |  |  |  |  |
Equity method investment (as a percent) | 49.00% |  |  |  |  |  |  |
Income (loss) from equity method investments | $ 205,000 |  |  |  |  |  |  |
EMCP II [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Distribution Made to Limited Partner, Cash Distributions Paid |  | 3,194,000 |  |  |  |  |  |
EMP III [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Consolidated assets | 6,031,000 |  | 6,030,000 |  |  |  |  |
Consolidated liabilities | 176,000 |  | 164,000 |  |  |  |  |
Trilantic [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Issued LP Units (in shares) |  |  |  |  |  |  |  | 500,000
Limited partnership investment |  |  |  |  |  |  |  | $ 16,090,000
G5 Evercore [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment | $ 22,596,000 |  | 20,730,000 |  |  |  |  |
Equity method investment (as a percent) | 49.00% |  |  |  |  |  |  |
Income (loss) from equity method investments | $ (248,000) | (57,000) |  |  |  |  |  |
ABS [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment | $ 37,360,000 |  | 41,567,000 |  |  |  |  |
Equity method investment (as a percent) | 45.00% |  |  |  |  |  |  |
Income (loss) from equity method investments | $ 1,330,000 | 1,164,000 |  |  |  |  |  |
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 |  | $ 2,750,000 |  |  |  |  |  |
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 | $ 4,437,000 |  |  |  |  |  |  |
EMCP III [Member] | Parent [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Capital commitment |  |  |  |  |  | 1,000,000 |  |
Unfunded commitments for capital contributions | 382,000 |  |  |  |  |  |  |
EMCP III [Member] | Noncontrolling Interest [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Capital commitment |  |  |  |  |  | 9,750,000 |  |
Trilantic [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Investment | 12,779,000 |  | 12,812,000 |  |  |  |  |
Trilantic [Member] | Trilantic IV [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Investment |  |  | 8,000 |  |  | 29,000 | $ 1,091,000 |
Trilantic [Member] | Trilantic V [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Capital commitment | 5,000,000 |  |  |  |  |  |  |
Unfunded commitments for capital contributions | 2,905,000 |  |  |  |  |  |  |
Investment | 33,000 |  | 636,000 |  | $ 689,000 | $ 825,000 |  |
Private Equity Funds [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment | 27,578,000 |  | 26,473,000 |  |  |  |  |
Private Equity Funds [Member] | ECP II [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment | 972,000 |  | 983,000 |  |  |  |  |
Cash | 741,000 |  |  |  |  |  |  |
Escrow Deposit | 85,000 |  |  |  |  |  |  |
Seller Note | 66,000 |  |  |  |  |  |  |
Marketable Securities | 80,000 |  |  |  |  |  |  |
Private Equity Funds [Member] | EMCP III [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment | 5,776,000 |  | 5,786,000 |  |  |  |  |
Private Equity Funds [Member] | Trilantic V [Member] |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment | $ 4,183,000 |  | $ 4,117,000 |  |  |  |  |

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