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Segment Reporting - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Segment	Dec. 31, 2012
Segment Reporting [Abstract]
Number of reporting segments	3
Number of operating segments	4
Accounts receivable attributable to unconsolidated affiliates	$ 36.2	$ 15.2

- Definition

Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due within 1 year (or 1 business cycle).

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