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Segment Reporting (Tables) | 3 Months Ended
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Mar. 31, 2016
Segment Reporting Information [Line Items] |
Schedule of Segment Reporting Information, by Segment |
| Three Months Ended
| March 31, 2016
| Apex |  | Oxford |  | Corporate(1) |  | Total
Revenues | $ | 433,155 |  |  | $ | 148,885 |  |  | $ | — |  |  | $ | 582,040 |
Gross profit | 126,144 |  |  | 61,638 |  |  | — |  |  | 187,782 |
Operating income | 39,986 |  |  | 12,760 |  |  | (14,989 | ) |  | 37,757 |
Amortization | 8,590 |  |  | 1,554 |  |  | — |  |  | 10,144 |
| Three Months Ended
| March 31, 2015
| Apex |  | Oxford (2) |  | Corporate(1) |  | Total
Revenues | $ | 295,971 |  |  | $ | 134,074 |  |  | $ | — |  |  | $ | 430,045 |
Gross profit | 80,152 |  |  | 55,723 |  |  | — |  |  | 135,875 |
Operating income | 22,896 |  |  | 12,713 |  |  | (10,538 | ) |  | 25,071 |
Amortization | 3,522 |  |  | 1,347 |  |  | — |  |  | 4,869 |
(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.
(2) | During the quarter ended June 30, 2015, due to management changes, the Company realigned its former Life Sciences Europe Segment to be included in the Oxford Segment. Prior periods have been adjusted to reflect this change.
Revenue by Type [Table Text Block] | The following table presents revenues by type (in thousands):
| Three Months Ended
| March 31,
| 2016 |  | % |  | 2015 |  | %
Revenues: |  |  |  |  |  |  |
Assignment | $ | 549,552 |  |  | 94.4 | % |  | $ | 406,141 |  |  | 94.4 | %
Permanent placement | 32,488 |  |  | 5.6 | % |  | 23,904 |  |  | 5.6 | %
| $ | 582,040 |  |  | 100.0 | % |  | $ | 430,045 |  |  | 100.0 | %
Schedule of Revenue by Geographical Areas | The Company operates internationally, with operations mainly in the United States, Europe, and Canada. The following table presents revenues by geographic location (in thousands):
| Three Months Ended
| March 31,
| 2016 |  | % |  | 2015 |  | %
Revenues: |  |  |  |  |  |  |
Domestic | $ | 554,438 |  |  | 95.3 | % |  | $ | 410,756 |  |  | 95.5 | %
Foreign | 27,602 |  |  | 4.7 | % |  | 19,289 |  |  | 4.5 | %
| $ | 582,040 |  |  | 100.0 | % |  | $ | 430,045 |  |  | 100.0 | %

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