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Investments - Additional Information (Detail) |  | 3 Months Ended | 6 Months Ended |  |  |  |  |
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Jul. 19, 2016 | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2010 USD ($) shares
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  | $ 85,942,000 |  | $ 85,942,000 |  | $ 86,287,000 |  |  |  |
Marketable Securities |  | 68,726,000 |  | 68,726,000 |  | 43,787,000 |  |  |  |
Unfunded commitments for capital contributions |  | 5,132,000 |  | 5,132,000 |  |  |  |  |  |
Net realized and unrealized gains (losses) on private equity fund investments, including performance fees |  | 4,764,000 | $ 1,815,000 | 6,131,000 | $ 1,326,000 |  |  |  |  |
Previously received carried interest subject to repayment |  | 0 |  | 0 |  |  |  |  |  |
Assets Held for Sale |  | 6,849,000 |  | 6,849,000 |  | 0 |  |  |  |
Liabilities Held for Sale |  | 1,510,000 |  | 1,510,000 |  | 0 |  |  |  |
Noncontrolling Interest |  | 237,174,000 |  | 237,174,000 |  | 202,664,000 |  |  |  |
Participation in Successor Funds |  | 12,000,000 |  | 12,000,000 |  |  |  |  |  |
Cost Method Investments |  |  | 1,079,000 |  | 1,079,000 |  |  |  |  |
Income (loss) from equity method investments |  | 1,664,000 | 1,998,000 | 2,951,000 | 3,105,000 |  |  |  |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Consolidated assets |  | 148,727,000 |  | 148,727,000 |  | 151,583,000 |  |  |  |
Consolidated liabilities |  | 84,540,000 |  | 84,540,000 |  | 110,424,000 |  |  |  |
Atalanta Sosnoff [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  | $ 23,387,000 |  | $ 23,387,000 |  | 23,990,000 |  |  |  |
Equity method investment (as a percent) |  | 49.00% |  | 49.00% |  |  |  |  |  |
Income (loss) from equity method investments |  | $ 143,000 |  | $ 348,000 |  |  |  |  |  |
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 |  |  |  |  | 1,650,000 |  |  |  |  |
EMP III [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest |  | 6,126,000 |  | 6,126,000 |  |  |  |  |  |
EMP III [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Consolidated assets |  | 6,572,000 |  | 6,572,000 |  | 6,030,000 |  |  |  |
Consolidated liabilities |  | 83,000 |  | 83,000 |  | 164,000 |  |  |  |
Trilantic [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Issued LP Units (in shares) | shares |  |  |  |  |  |  |  |  |  | 500,000
Limited partnership investment |  |  |  |  |  |  |  |  |  | $ 16,090,000
G5 Evercore [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  | $ 24,665,000 |  | $ 24,665,000 |  | 20,730,000 |  |  |  |
Equity method investment (as a percent) |  | 49.00% |  | 49.00% |  |  |  |  |  |
Income (loss) from equity method investments |  | $ 277,000 | 708,000 | $ 29,000 | 651,000 |  |  |  |  |
ABS [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  | $ 37,890,000 |  | $ 37,890,000 |  | 41,567,000 |  |  |  |
Equity method investment (as a percent) |  | 45.00% |  | 45.00% |  |  |  |  |  |
Income (loss) from equity method investments |  | $ 1,244,000 | 1,290,000 | $ 2,574,000 | 2,454,000 |  |  |  |  |
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 |  |  |  |  |
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest |  | 237,174,000 | 197,109,000 | $ 237,174,000 | 197,109,000 | 202,664,000 | $ 160,952,000 |  |  |
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% |  |  |  |  |  |
Equity Method Investments [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization of Intangible Assets |  | 884,000 | $ 621,000 | $ 1,764,000 | $ 1,242,000 |  |  |  |  |
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 |  | 3,675,000 |  | 3,675,000 |  |  |  |  |  |
EMCP III [Member] | Parent [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Capital commitment |  |  |  |  |  |  |  | 1,000,000 |  |
Unfunded commitments for capital contributions |  | 300,000 |  | 300,000 |  |  |  |  |  |
EMCP III [Member] | Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Capital commitment |  |  |  |  |  |  |  | 9,750,000 |  |
Trilantic [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Investment |  | 12,242,000 |  | 12,242,000 |  | 12,812,000 |  |  |  |
Trilantic [Member] | Trilantic IV [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Investment |  | 33,000 |  | 33,000 |  | 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 |  | 2,550,000 |  | 2,550,000 |  |  |  |  |  |
Investment |  | 537,000 |  | 537,000 |  | 636,000 | $ 689,000 | $ 825,000 |  |
Private Equity Funds [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  | 23,527,000 |  | 23,527,000 |  | 26,473,000 |  |  |  |
Private Equity Funds [Member] | ECP II [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  | 959,000 |  | 959,000 |  | 983,000 |  |  |  |
Cash |  | 818,000 |  | 818,000 |  |  |  |  |  |
Seller Note |  | 61,000 |  | 61,000 |  |  |  |  |  |
Marketable Securities |  | 80,000 |  | 80,000 |  |  |  |  |  |
Private Equity Funds [Member] | EMCP III [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  | 544,000 |  | 544,000 |  | 5,786,000 |  |  |  |
Private Equity Funds [Member] | Trilantic V [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment |  | 5,039,000 |  | 5,039,000 |  | $ 4,117,000 |  |  |  |
Investments [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Held for Sale |  | 5,847,000 |  | 5,847,000 |  |  |  |  |  |
Cash and Cash Equivalents [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Assets Held for Sale |  | $ 906,000 |  | $ 906,000 |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Management Fee Period | 10 years |  |  |  |  |  |  |  |  |
Number Of Successor Funds Returning Carried Interest | 2 |  |  |  |  |  |  |  |  |
Operational Support Period | 18 months |  |  |  |  |  |  |  |  |

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