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Financial instruments - Quantitative Information about Level 3 Fair Value Measurements (Detail) (Level 3 [Member], Auction Rate Securities [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended | 3 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2013 Minimum [Member] | Mar. 31, 2013 Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Principal | $ 117,541 |  |
Valuation Adjustment | 7,882 |  |
Fair Value | $ 109,659 |  |
Valuation Technique | Discounted Cash Flow |  |
Discount Rate |  | 0.85% | 2.64%
Duration |  | 5 years | 8 years
Current Yield |  | 0.20% | 1.33%

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- Definition Fair value unobservable input current yield. + References No definition available. + Details
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- Definition Fair value unobservable inputs duration. + References No definition available. + Details
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- Definition Amount represents the principal amount of the level 3 assets used for the quantitative disclosure. + References No definition available. + Details
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- Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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