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Segment information - Revenue Classified by Major Geographic Areas (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 239,146	$ 238,214
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	228,693	225,635
Europe/Middle Ease [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	8,403	9,913
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	825	190
South America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 1,225	$ 2,476

X

- Definition

Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

+ 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=6880815&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

+ Details

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Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration