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Business Segments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Foreign Currency Translation [Line Items]
Percentages Revenue	54.00%	55.00%
Foreign currency exchange rate of west corporation or any of its subsidiaries	$ 0.6	$ 1.6
Platform-Based Services [Member]
Foreign Currency Translation [Line Items]
Revenue from platform-based services	481.4	448.8
Revenue from agent-based services	$ 181.4	$ 192.8
Other Foreign Countries [Member]
Foreign Currency Translation [Line Items]
Percentages of Net Revenue	19.00%	19.00%
Aggregate revenue as a percentage of total revenue from largest one client	10.00%	10.00%

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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