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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 5 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Minimum | Dec. 31, 2013 Maximum | May 30, 2014 Subsequent Event segment
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of interest in joint ventures |  |  |  | 20.00% | 50.00% |
Number of operating segments |  |  |  |  |  | 2
Deferred costs associated with yearly planed major maintenance, amortization period | 12 months |  |  |  |  |
Definite-lived intangible assets useful life |  |  |  | 5 years | 40 years |
Foreign exchange transaction gains (losses) | $ 10.6 | $ 4.9 | $ 3.6 |  |  |
Maximum remaining expiration period for foreign currency forward contracts | 1 year |  |  |  |  |
Notional amount | $ 321.4 | $ 274.0 |  |  |  |

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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 Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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