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Fair Value of Financial Instruments Summary of Estimated Fair Values of Investments and Remaining Unfunded Commitments for Each Major Category of Investments (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Carrying Amount $ 387,275
Fair Value 495,519
Unfunded Commitments 20,180
Non-marketable securities | Fair value accounting | Venture capital and private equity fund investments  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Carrying Amount 141,649
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Planned Sale, Investments Not Identified, Value 141,649
Unfunded Commitments 4,504
Non-marketable securities | Equity method accounting | Venture capital and private equity fund investments  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Carrying Amount 82,823
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Planned Sale, Investments Not Identified, Value 82,823
Unfunded Commitments 4,953
Non-marketable securities | Equity method accounting | Debt Securities  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Carrying Amount 17,020
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Planned Sale, Investments Not Identified, Value 18,187
Unfunded Commitments 0
Non-marketable securities | Equity method accounting | Other investments  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Carrying Amount 31,177
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Planned Sale, Investments Not Identified, Value 31,180
Unfunded Commitments 715
Non-marketable securities | Cost method accounting | Venture capital and private equity fund investments  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Carrying Amount 114,606
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Planned Sale, Investments Not Identified, Value 221,680
Unfunded Commitments $ 10,008