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Financial Instruments - Information Regarding Swaps (Detail) (USD $) In Millions, unless otherwise specified |  |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Interest Rate Swaps One [Member] | Dec. 31, 2012 Interest Rate Swaps Two [Member] | Dec. 31, 2012 Interest Rate Swaps Three [Member] | Dec. 31, 2012 Interest Rate Swaps Four [Member] | Dec. 31, 2012 Interest Rate Swaps Five [Member] | Dec. 31, 2012 Interest Rate Swaps Six [Member] | Dec. 31, 2012 Interest Rate Swap Seven [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount of interest rate derivatives | $ 632.8 | $ 284.1 | $ 100.0 | $ 50.0 | $ 100.0 | $ 82.8 | $ 100.0 | $ 100.0 | $ 100.0
LIBOR Fixed Rate |  |  | 1.00% | 0.60% | 0.50% | 2.80% | 0.90% | 1.60% | 1.50%
Maturity Date |  |  | Jun. 01, 2014 | Jun. 01, 2015 | Jul. 01, 2015 | Sep. 01, 2017 | Jan. 01, 2018 | Feb. 01, 2019 | Feb. 01, 2019

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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Details
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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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