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Derivative Instruments and Hedging Activities - Commitment of Foreign Currency Forward Contracts (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012
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Derivative [Line Items] |
Fair Value / Carrying Amount of Asset (Liability) Hedge Derivatives | $ 0.5
Fair Value / Carrying Amount of Asset (Liability) Non-hedge Derivatives | 2.4
Expected Maturity Amount of Foreign Currency Derivatives in Current Year | 73.7
NOK [Member] |
Derivative [Line Items] |
Contract Amount in Foreign Currency | 201.0
Average Forward Rate | 5.93
Fair Value / Carrying Amount of Asset (Liability) Non-hedge Derivatives | 2.1
Expected Maturity Amount of Foreign Currency Derivatives in Current Year | 33.9
Euro [Member] |
Derivative [Line Items] |
Contract Amount in Foreign Currency | 9.8
Average Forward Rate | 0.76
Fair Value / Carrying Amount of Asset (Liability) Non-hedge Derivatives | (0.1)
Expected Maturity Amount of Foreign Currency Derivatives in Current Year | 13.0
Canadian Dollar [Member] |
Derivative [Line Items] |
Contract Amount in Foreign Currency | 9.3
Average Forward Rate | 1.01
Fair Value / Carrying Amount of Asset (Liability) Hedge Derivatives | 0.2
Expected Maturity Amount of Foreign Currency Derivatives in Current Year | 9.2
British Pounds [Member] |
Derivative [Line Items] |
Contract Amount in Foreign Currency | 11.3
Average Forward Rate | 0.64
Fair Value / Carrying Amount of Asset (Liability) Hedge Derivatives | 0.3
Fair Value / Carrying Amount of Asset (Liability) Non-hedge Derivatives | 0.4
Expected Maturity Amount of Foreign Currency Derivatives in Current Year | $ 17.6

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- Definition Average contractual rate at which a foreign currency can be purchased or sold. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of all foreign currency derivatives not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Fair value as of the balance sheet date of all derivatives designated as foreign currency fair value hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Aggregate notional amount of foreign currency exchange rate derivatives. Notional amount refers to the number of currency units specified in the foreign currency derivative contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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