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Financial Instruments and Risk - Additional Information (Detail)
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12 Months Ended | |
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Dec. 31, 2014
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Dec. 31, 2013
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| Schedule Of Cost Method Investments [Line Items] | ||
| Average days to maturity of Company's portfolio of cash equivalents and marketable securities | 174 days | 50 days |
| Maximum | ||
| Schedule Of Cost Method Investments [Line Items] | ||
| Maturity period of securities | 1 year | |
| X | ||||||||||
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- Definition
Average period to maturity for portfolio of cash and marketable securities. No definition available.
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| X | ||||||||||
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- Definition
Maturity period of securities. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Details
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