Currency Transaction Gains/Losses (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Currency Transaction Gains (Losses) [Line Items]
Net transaction gains (losses)	$ 63,519	$ 32,451	$ 36,404
Operating Income
Currency Transaction Gains (Losses) [Line Items]
Net transaction gains (losses)	61,956	34,299	39,376
Other non-operating income (expense), net
Currency Transaction Gains (Losses) [Line Items]
Net transaction gains (losses)	$ 1,563	$ (1,848)	$ (2,972)

- Definition

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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