Investments - Debt, Equity and Other Securities - Summary of the Company's Portfolio of Cost Method Investments (Detail) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2013
|
Dec. 31, 2012
|
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Schedule of Cost-method Investments [Line Items] | ||
Cost of investments | $ 32,681 | $ 33,524 |
Venture capital funds [Member]
|
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Schedule of Cost-method Investments [Line Items] | ||
Cost of investments | 64 | |
Equity investments [Member]
|
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Schedule of Cost-method Investments [Line Items] | ||
Cost of investments | 32,516 | 33,298 |
Convertible note [Member]
|
||
Schedule of Cost-method Investments [Line Items] | ||
Cost of investments | $ 165 | $ 162 |