Segment Information - Additional Information (Detail) (USD $)	3 Months Ended
Mar. 31, 2013 Segment	Mar. 31, 2012
Segment Reporting Information [Line Items]
Operating segments	4
Net foreign currency transaction losses	$ 2.1
Net foreign currency transaction gains		$ 2.9

Aggregate realized and unrealized gain on foreign currency transactions included in net income. Includes gain on a foreign currency forward exchange contract. Does not include foreign currency transactions designated as hedges of net investment in a foreign entity or intercompany foreign currency transactions that are of a long-term nature. Gross of tax effect.

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Aggregate realized and unrealized loss on foreign currency transactions included in net income. Includes loss on a foreign currency forward exchange contract. Does not include foreign currency transactions designated as hedges of net investment in a foreign entity or intercompany foreign currency transactions that are of a long-term nature. Gross of tax effect.

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