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Fair Value Measurements - Schedule of Reconciliation of Level 3 Investments Available-for-Sale Securities (Detail) (USD $)
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3 Months Ended | 9 Months Ended |
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Sep. 30, 2014
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Sep. 30, 2014
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| Fair Value Disclosures [Abstract] | ||
| Balance, beginning of period | $ 67,600,000 | $ 3,213,000 |
| Transfers to / purchases of available-for-sale debt securities | 83,500,000 | |
| Sale of available-for-sale debt securities | (22,900,000) | (43,600,000) |
| Unrealized gain on debt securities transferred to available for sale | 5,000,000 | |
| Unrealized (loss) on debt securities | (1,300,000) | (1,500,000) |
| Balance, end of period | $ 43,447,000 | $ 43,447,000 |
| X | ||||||||||
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- Definition
Available For Sale Securities Debt Securities Gross Unrealized Gain (Loss) No definition available.
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- Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash inflow associated with the sale of debt securities classified as available-for-sale securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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