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Segment Information - Revenues Classified by Major Geographic Areas (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 231,838	$ 231,619	$ 703,197	$ 729,554
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	222,226	219,545	670,339	691,107
Europe / Middle East [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	5,894	7,093	21,428	21,881
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	1,913	2,787	5,359	9,172
South America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 1,805	$ 2,194	$ 6,071	$ 7,394