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Interest Income and Other (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Interest and Other Income [Line Items]
Interest income									$ 6,350	$ 6,200	$ 5,442
Foreign exchange transaction gains (losses), net									250	(560)	(542)
Other									(941)	664	(477)
Interest income and other	$ 1,156	$ 1,584	$ (363)	$ 3,282	$ 895	$ 486	$ 2,923	$ 2,000	$ 5,659	$ 6,304	$ 4,423

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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