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Business Segments (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment | The following tables present revenues, gross profit, operating income and amortization by reportable segment (in thousands):
| Year ended December 31, 2017
| Apex |  | Oxford |  | Corporate(1) |  | Total
Revenues | $ | 2,037,154 |  |  | $ | 588,770 |  |  | $ | — |  |  | $ | 2,625,924 |
Gross profit | 606,294 |  |  | 243,779 |  |  | — |  |  | 850,073 |
Operating income | 222,010 |  |  | 53,787 |  |  | (51,061 | ) |  | 224,736 |
Amortization | 29,361 |  |  | 4,083 |  |  | — |  |  | 33,444 |
| Year ended December 31, 2016
| Apex |  | Oxford |  | Corporate(1) |  | Total
Revenues | $ | 1,836,488 |  |  | $ | 603,925 |  |  | $ | — |  |  | $ | 2,440,413 |
Gross profit | 548,421 |  |  | 246,762 |  |  | — |  |  | 795,183 |
Operating income | 195,133 |  |  | 51,294 |  |  | (56,701 | ) |  | 189,726 |
Amortization | 34,359 |  |  | 5,269 |  |  | — |  |  | 39,628 |
| Year ended December 31, 2015
| Apex |  | Oxford |  | Corporate(1) |  | Total
Revenues | $ | 1,493,608 |  |  | $ | 571,400 |  |  | $ | — |  |  | $ | 2,065,008 |
Gross profit | 439,586 |  |  | 239,159 |  |  | — |  |  | 678,745 |
Operating income | 151,450 |  |  | 59,059 |  |  | (58,401 | ) |  | 152,108 |
Amortization | 28,371 |  |  | 6,096 |  |  | — |  |  | 34,467 |
(1) | Corporate expenses primarily consist of consolidated stock-based compensation expense, compensation for corporate employees, acquisition, integration and strategic planning expenses, public company expenses and depreciation expense for corporate assets.
Revenue by Type [Table Text Block] | The following table presents revenues by type (in thousands):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Revenues: |  |  |  |  |  |
Assignment |  | $ | 2,496,314 |  |  | $ | 2,312,271 |  |  | $ | 1,947,001 |
Permanent placement |  | 129,610 |  |  | 128,142 |  |  | 118,007 |
|  | $ | 2,625,924 |  |  | $ | 2,440,413 |  |  | $ | 2,065,008 |
Disclosure on Geographic Areas, Description of Revenue from External Customers | The Company operates internationally, with operations in the United States, Europe and Canada. The following table presents revenues by geographic location (in thousands):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Revenues: |  |  |  |  |  |
Domestic |  | $ | 2,494,446 |  |  | $ | 2,324,713 |  |  | $ | 1,972,888 |
Foreign |  | 131,478 |  |  | 115,700 |  |  | 92,120 |
|  | $ | 2,625,924 |  |  | $ | 2,440,413 |  |  | $ | 2,065,008 |
Long Lived Assets By Geographic Location Domestic And Foreign | The following table presents long-lived assets by geographic location (in thousands):
|  | December 31,
|  | 2017 |  | 2016
Long-lived assets: |  |  |  |
Domestic |  | $ | 56,137 |  |  | $ | 55,801 |
Foreign |  | 1,859 |  |  | 1,141 |
|  | $ | 57,996 |  |  | $ | 56,942 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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