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Reconciliation of Revenue and Operating Income (Loss) by Reportable Segment to Consolidated Results (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
Segment Reporting 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
Operating income (loss) |  |  |  |  |  |  |  |  |  | 343,446 | 249,418 | 115,000
Amortization of intangible assets |  |  |  |  |  |  |  |  |  | 398 | 153 | 411
Interest income, net |  |  |  |  |  |  |  |  |  | (1,197) | (951) | (579)
Income before income taxes | 97,242 | 94,467 | 72,272 | [1] | 80,264 | 72,161 | 72,195 | 61,284 | 44,576 | 344,245 | 250,216 | 115,168
Temporary and consultant staffing |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  |  | 3,324,286 | 3,050,999 | 2,568,255
Operating income (loss) |  |  |  |  |  |  |  |  |  | 276,826 | 209,101 | 108,443
Permanent placement staffing |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  |  | 334,198 | 302,155 | 221,219
Operating income (loss) |  |  |  |  |  |  |  |  |  | 55,745 | 35,340 | 17,502
Risk consulting and internal audit services |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  |  | 452,729 | 423,822 | 385,619
Operating income (loss) |  |  |  |  |  |  |  |  |  | $ 10,875 | $ 4,977 | $ (10,945)
[1] | The decrease in second quarter 2012 income before income taxes, net income, and net income per share was primarily due to a charge related to a litigation settlement disclosed in the Company's July 5, 2012, Form 8-K. The settlement resulted in a non-recurring $19.0 million pre-tax charge to selling, general and administrative expenses and reduced second quarter net income and net income per share by $11.4 million and $0.08 per share, respectively.

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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