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Segment information - Revenue Classified by Major Geographic Areas (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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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

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- 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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