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Segment Information - Revenue Classified by Major Geographic Areas (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 243,830	$ 233,145	$ 482,976	$ 471,359
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	232,781	222,478	461,474	448,113
Europe/Middle East [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	9,317	8,767	17,720	18,680
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	709	111	1,534	301
South America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 1,023	$ 1,789	$ 2,248	$ 4,265

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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