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Derivative Instruments and Risk Management - Summary of Foreign Currency Forward Exchange Contracts Which Have Not Been Designated as Hedging Instruments, and Their Impact on Income Statement (Detail) (Not Designated as Hedging Instrument [Member], Foreign Currency Forward Exchange Contracts [Member], Other Income/(Expense) [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward Exchange Contracts [Member] | Other Income/(Expense) [Member] |  |  |
Summary of foreign currency forward exchange contracts which have not been designated as hedging instruments, and their impact on the income statement |  |  |
Amount of Gain/(Loss) Recognized in Income | $ (1.5) | $ 1.2 | $ 1.3

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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