The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses).

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