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Fair Value of Financial Instruments - Additional Information about Level 3 Assets Measured at Fair Value on a Recurring Basis (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 130,853 $ 137,208
Total Realized and Unrealized Gains (Losses) Included in Income 6,609 7,149
Sales (17,086) (15,416)
Issuances 4,030 2,374
Distributions and Other Settlements 0 30
Transfers Out of Level 3 (167) (323)
Ending Balance 124,239 131,022
Equity warrant assets | Other assets    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 128,813 135,168
Total Realized and Unrealized Gains (Losses) Included in Income 6,609 7,179
Sales (17,086) (15,416)
Issuances 4,030 2,374
Distributions and Other Settlements 0 0
Transfers Out of Level 3 (167) (323)
Ending Balance 122,199 128,982
Non-marketable securities | Fair value accounting | Other venture capital investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 2,040 2,040
Total Realized and Unrealized Gains (Losses) Included in Income 0 (30)
Sales 0 0
Issuances 0 0
Distributions and Other Settlements 0 30
Transfers Out of Level 3 0 0
Ending Balance $ 2,040 $ 2,040