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Segment Reporting (Tables) | 9 Months Ended
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Sep. 30, 2015
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):
| Three Months Ended |  | Three Months Ended
| September 30, 2015 |  | September 30, 2014
| Apex |  | Oxford |  | Corporate |  | Total |  | Apex |  | Oxford |  | Corporate |  | Total
Revenues | $ | 421,067 |  |  | $ | 151,056 |  |  | $ | — |  |  | $ | 572,123 |  |  | $ | 306,027 |  |  | $ | 136,416 |  |  | $ | — |  |  | $ | 442,443 |
Gross profit | 128,731 |  |  | 62,673 |  |  | — |  |  | 191,404 |  |  | 87,323 |  |  | 57,515 |  |  | — |  |  | 144,838 |
Operating income | 48,119 |  |  | 19,283 |  |  | (15,937 | ) |  | 51,465 |  |  | 33,735 |  |  | 19,065 |  |  | (14,102 | ) |  | 38,698 |
Amortization | 9,732 |  |  | 1,593 |  |  | — |  |  | 11,325 |  |  | 4,089 |  |  | 1,443 |  |  | — |  |  | 5,532 |
| Nine Months Ended |  | Nine Months Ended
| September 30, 2015 |  | September 30, 2014
| Apex |  | Oxford |  | Corporate |  | Total |  | Apex |  | Oxford |  | Corporate |  | Total
Revenues | $ | 1,054,064 |  |  | $ | 433,427 |  |  | $ | — |  |  | $ | 1,487,491 |  |  | $ | 882,328 |  |  | $ | 401,390 |  |  | $ | — |  |  | $ | 1,283,718 |
Gross profit | 306,026 |  |  | 179,787 |  |  | — |  |  | 485,813 |  |  | 247,506 |  |  | 167,392 |  |  | — |  |  | 414,898 |
Operating income | 105,258 |  |  | 53,858 |  |  | (49,870 | ) |  | 109,246 |  |  | 88,227 |  |  | 53,699 |  |  | (39,951 | ) |  | 101,975 |
Amortization | 18,638 |  |  | 4,513 |  |  | — |  |  | 23,151 |  |  | 12,267 |  |  | 4,317 |  |  | 8 |  |  | 16,592 |
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 |  | Nine Months Ended
| September 30, |  | September 30,
| 2015 |  | % |  | 2014 |  | % |  | 2015 |  | % |  | 2014 |  | %
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 546,747 |  |  | 95.6 | % |  | $ | 421,640 |  |  | 95.3 | % |  | $ | 1,420,492 |  |  | 95.5 | % |  | $ | 1,223,217 |  |  | 95.3 | %
Foreign | 25,376 |  |  | 4.4 | % |  | 20,803 |  |  | 4.7 | % |  | 66,999 |  |  | 4.5 | % |  | 60,501 |  |  | 4.7 | %
| $ | 572,123 |  |  | 100.0 | % |  | $ | 442,443 |  |  | 100.0 | % |  | $ | 1,487,491 |  |  | 100.0 | % |  | $ | 1,283,718 |  |  | 100.0 | %

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- Definition Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9038-108599 + Details
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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=51669610&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=51669610&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=51669610&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=51669610&loc=d3e8736-108599 + Details
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