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Revenue and Long-Lived Assets by Geographic Location (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Schedule Of Geographical Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues | $ 1,034,213 | $ 1,033,173 | $ 1,028,383 | $ 1,015,444 | $ 973,473 | $ 984,668 | $ 937,966 | $ 880,869 | $ 4,111,213 | $ 3,776,976 | $ 3,175,093
Assets, long-lived | 107,680 |  |  |  | 107,972 |  |  |  | 107,680 | 107,972 | 103,651
Domestic |  |  |  |  |  |  |  |  |  |  |
Schedule Of Geographical Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  | 3,022,274 | 2,655,443 | 2,263,316
Assets, long-lived | 86,239 |  |  |  | 87,146 |  |  |  | 86,239 | 87,146 | 86,689
Foreign |  |  |  |  |  |  |  |  |  |  |
Schedule Of Geographical Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  | 1,088,939 | 1,121,533 | 911,777
Assets, long-lived | $ 21,441 |  |  |  | $ 20,826 |  |  |  | $ 21,441 | $ 20,826 | $ 16,962

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- Definition Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 12 -Paragraph 5 -Subparagraph b, c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 + Details
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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + 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(d)) -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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