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Financial Instruments - Information Regarding Swaps (Detail) (USD $) In Millions, unless otherwise specified |  |  | 6 Months Ended
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Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Interest Rate Swaps One [Member] | Jun. 30, 2013 Interest Rate Swaps Two [Member] | Jun. 30, 2013 Interest Rate Swaps Three [Member] | Jun. 30, 2013 Interest Rate Swaps Four [Member] | Jun. 30, 2013 Interest Rate Swaps Five [Member] | Jun. 30, 2013 Interest Rate Swaps Six [Member] | Jun. 30, 2013 Interest Rate Swaps Seven [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Notional amount of interest rate derivatives | $ 632.1 | $ 632.8 | $ 100.0 | $ 50.0 | $ 100.0 | $ 82.1 | $ 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. 28, 2014 | Jun. 01, 2015 | Jul. 01, 2015 | Sep. 01, 2017 | Jan. 02, 2018 | Feb. 01, 2019 | Feb. 01, 2019

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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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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