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Business Segments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Foreign Currency Translation [Line Items]
Percentages Revenue	60.00%	55.00%	57.00%	55.00%
Aggregate revenue as a percentage of total revenue from largest one client	10.00%	10.00%	10.00%	10.00%
Threshold percentage of aggregate revenue		9.00%		10.00%
Percentages of Net Revenue	18.00%	19.00%	19.00%	20.00%
Foreign currency exchange rate of west corporation or any of its subsidiaries	$ (1.2)	$ 0.1	$ (2.4)	$ 2.8

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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