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Segment Reporting (Tables) | 9 Months Ended
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Sep. 30, 2018
Segment Reporting Information [Line Items] |
Schedule of Segment Reporting Information, by Segment | The following tables present revenues, gross profit, operating income and amortization by reportable segment (in thousands):
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Apex: |  |  |  |  |  |  |  |
Revenues |  | $ | 589,717 |  |  | $ | 517,492 |  |  | $ | 1,695,728 |  |  | $ | 1,502,462 |
Gross profit |  | 177,831 |  |  | 155,783 |  |  | 506,146 |  |  | 445,925 |
Operating income |  | 71,443 |  |  | 59,016 |  |  | 192,610 |  |  | 162,679 |
Amortization |  | 6,546 |  |  | 7,194 |  |  | 19,638 |  |  | 21,983 |
Oxford: |  |  |  |  |  |  |  |
Revenues |  | $ | 152,701 |  |  | $ | 149,556 |  |  | $ | 455,222 |  |  | $ | 444,427 |
Gross profit |  | 62,712 |  |  | 62,532 |  |  | 187,321 |  |  | 183,471 |
Operating income |  | 15,156 |  |  | 16,088 |  |  | 39,794 |  |  | 39,525 |
Amortization |  | 1,040 |  |  | 1,054 |  |  | 3,143 |  |  | 3,028 |
ECS: |  |  |  |  |  |  |  |
Revenues |  | $ | 164,031 |  |  | $ | — |  |  | $ | 319,181 |  |  | $ | — |
Gross profit |  | 29,629 |  |  | — |  |  | 58,288 |  |  | — |
Operating income |  | 4,314 |  |  | — |  |  | 8,012 |  |  | — |
Amortization |  | 10,954 |  |  | — |  |  | 21,908 |  |  | — |
Corporate: |  |  |  |  |  |  |  |
Operating loss(1) |  | $ | (16,616 | ) |  | $ | (14,234 | ) |  | $ | (54,745 | ) |  | $ | (38,265 | )
Consolidated: |  |  |  |  |  |  |  |
Revenues |  | $ | 906,449 |  |  | $ | 667,048 |  |  | $ | 2,470,131 |  |  | $ | 1,946,889 |
Gross profit |  | 270,172 |  |  | 218,315 |  |  | 751,755 |  |  | 629,396 |
Operating income |  | 74,297 |  |  | 60,870 |  |  | 185,671 |  |  | 163,939 |
Amortization |  | 18,540 |  |  | 8,248 |  |  | 44,689 |  |  | 25,011 |
_____________
(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.
Disaggregation of Revenue [Table Text Block] | The following table presents our revenues disaggregated by type (in thousands):
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Apex: |  |  |  |  |  |  |  |
Assignment |  | $ | 575,309 |  |  | $ | 506,376 |  |  | $ | 1,653,835 |  |  | $ | 1,468,976 |
Permanent placement |  | 14,408 |  |  | 11,116 |  |  | 41,893 |  |  | 33,486 |
|  | $ | 589,717 |  |  | $ | 517,492 |  |  | $ | 1,695,728 |  |  | $ | 1,502,462 |
Oxford: |  |  |  |  |  |  |  |
Assignment |  | $ | 130,365 |  |  | $ | 127,963 |  |  | $ | 386,068 |  |  | $ | 379,892 |
Permanent placement |  | 22,336 |  |  | 21,593 |  |  | 69,154 |  |  | 64,535 |
|  | $ | 152,701 |  |  | $ | 149,556 |  |  | $ | 455,222 |  |  | $ | 444,427 |
ECS: |  |  |  |  |  |  |  |
Firm-fixed-price |  | $ | 48,272 |  |  | $ | — |  |  | $ | 93,034 |  |  | $ | — |
Time and materials |  | 42,102 |  |  | — |  |  | 91,097 |  |  | — |
Cost-plus-fixed-fee |  | 73,657 |  |  | — |  |  | 135,050 |  |  | — |
|  | $ | 164,031 |  |  | $ | — |  |  | $ | 319,181 |  |  | $ | — |
Consolidated |  | $ | 906,449 |  |  | $ | 667,048 |  |  | $ | 2,470,131 |  |  | $ | 1,946,889 |
Schedule of Revenue by Geographical Areas | The Company operates internationally, with operations mainly in the United States. The following table presents revenues by geographic location (in thousands):
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2018 |  | % |  | 2017 |  | % |  | 2018 |  | % |  | 2017 |  | %
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic |  | $ | 867,754 |  |  | 95.7 | % |  | $ | 632,584 |  |  | 94.8 | % |  | $ | 2,352,993 |  |  | 95.3 | % |  | $ | 1,849,567 |  |  | 95.0 | %
Foreign |  | 38,695 |  |  | 4.3 | % |  | 34,464 |  |  | 5.2 | % |  | 117,138 |  |  | 4.7 | % |  | 97,322 |  |  | 5.0 | %
|  | $ | 906,449 |  |  | 100.0 | % |  | $ | 667,048 |  |  | 100.0 | % |  | $ | 2,470,131 |  |  | 100.0 | % |  | $ | 1,946,889 |  |  | 100.0 | %

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