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Reconciliation of Revenue and Operating Income by Reportable Segment to Consolidated Results (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues | $ 1,083,864 | $ 1,075,119 | $ 1,063,228 | $ 1,023,684 | $ 1,034,213 | $ 1,033,173 | $ 1,028,383 | $ 1,015,444 | $ 4,245,895 | $ 4,111,213 | $ 3,776,976
Operating income |  |  |  |  |  |  |  |  | 398,277 | 343,446 | 249,418
Amortization of intangible assets |  |  |  |  |  |  |  |  | 1,700 | 398 | 153
Interest income, net |  |  |  |  |  |  |  |  | (1,002) | (1,197) | (951)
Income before income taxes | 103,894 | 103,713 | 100,596 | 89,376 | 97,242 | 94,467 | 72,272 | 80,264 | 397,579 | 344,245 | 250,216
Temporary and consultant staffing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  | 3,369,840 | 3,324,286 | 3,050,999
Operating income |  |  |  |  |  |  |  |  | 301,185 | 276,826 | 209,101
Permanent placement staffing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  | 347,715 | 334,198 | 302,155
Operating income |  |  |  |  |  |  |  |  | 54,390 | 55,745 | 35,340
Risk consulting and internal audit services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  | 528,340 | 452,729 | 423,822
Operating income |  |  |  |  |  |  |  |  | $ 42,702 | $ 10,875 | $ 4,977

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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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: 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 3: 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=26713463&loc=d3e16323-109275 + Details
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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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