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Fair Value of Financial Instruments - Additional Information about Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Purchases $ 575 $ 0
Equity warrant assets | Other assets    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Purchases 575 0
Non-marketable securities | Fair value accounting | Unconsolidated venture capital and private equity fund investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Purchases 0 0
Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 146,278 122,250
Total Realized and Unrealized Gains (Losses) Included in Income 19,118 18,693
Sales/Exits (12,304) (12,128)
Issuances 4,543 4,899
Distributions and Other Settlements 3 0
Transfers Out of Level 3 (429) (1,207)
Ending Balance 157,784 132,507
Recurring | Equity warrant assets | Other assets    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 145,199 121,331
Total Realized and Unrealized Gains (Losses) Included in Income 19,165 18,611
Sales/Exits (12,304) (12,128)
Issuances 4,543 4,899
Distributions and Other Settlements 0 0
Transfers Out of Level 3 (429) (1,207)
Ending Balance 156,749 131,506
Recurring | Non-marketable securities | Fair value accounting | Unconsolidated venture capital and private equity fund investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance 1,079 919
Total Realized and Unrealized Gains (Losses) Included in Income (47) 82
Sales/Exits 0 0
Issuances 0 0
Distributions and Other Settlements 3 0
Transfers Out of Level 3 0 0
Ending Balance $ 1,035 $ 1,001