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Segment Information - Revenue Classified by Major Geographic Areas (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 243,376	$ 231,838	$ 726,352	$ 703,197
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	231,777	222,226	693,251	670,339
Europe/Middle East [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	9,210	7,475	26,930	26,155
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	1,309	332	2,843	633
South America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 1,080	$ 1,805	$ 3,328	$ 6,070

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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