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Fair Value Measurements - Schedule of Classification of Investments and Certain Other Assets and Liabilities Measured at Fair Value on Recurring Basis and Investments Measured at NAV (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investments $ 574,638 $ 426,630
Total Derivative Assets 11,967 3,732
Total investments measured at fair value 586,605 430,362
Securities sold, not yet purchased 3,929 7,338
Contingent consideration liability 10,009 28,941
Total Derivative Liabilities 188,962 198,417
Total of Liabilities Measured at Fair Value 202,900 234,696
Fair Value, Measurements, Recurring [Member] | NAV [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total investments measured at fair value 57,273 80,378
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total investments measured at fair value 515,743 344,660
Securities sold, not yet purchased 3,929 7,338
Total of Liabilities Measured at Fair Value 3,929 7,338
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total Derivative Assets 11,967 3,732
Total investments measured at fair value 11,967 3,732
Total Derivative Liabilities 188,962 198,417
Total of Liabilities Measured at Fair Value 188,962 198,417
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total investments measured at fair value 1,622 1,592
Contingent consideration liability 10,009 28,941
Total of Liabilities Measured at Fair Value 10,009 28,941
Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investments 202,874 6
Debt [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investments 202,874 6
Equities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investments 32,261 45,257
Equities [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investments 30,639 43,665
Equities [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investments 1,622 1,592
Alternative Investment Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investments 17,752 20,993
Alternative Investment Funds [Member] | Fair Value, Measurements, Recurring [Member] | NAV [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investments 889 3,640
Alternative Investment Funds [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investments 16,863 17,353
Debt Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investments 90,320 84,077
Debt Funds [Member] | Fair Value, Measurements, Recurring [Member] | NAV [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investments 7 6
Debt Funds [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investments 90,313 84,071
Equity Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investments 175,088 199,618
Equity Funds [Member] | Fair Value, Measurements, Recurring [Member] | NAV [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investments 34 53
Equity Funds [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investments 175,054 199,565
Private Equity Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investments 56,343 76,679
Private Equity Funds [Member] | Fair Value, Measurements, Recurring [Member] | NAV [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Investments $ 56,343 $ 76,679