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Goodwill and Identifiable Assets (Tables) | 3 Months Ended
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Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill for the year ended December 31, 2015 and the three months ended March 31, 2016 are as follows (in thousands):
| Apex Segment |  | Oxford Segment |  | Total
Balance as of December 31, 2014 | $ | 287,951 |  |  | $ | 224,109 |  |  | $ | 512,060 |
Creative Circle Acquisition | 358,029 |  |  | — |  |  | 358,029 |
LabResource Acquisition | — |  |  | 6,449 |  |  | 6,449 |
Translation adjustment | (1,363 | ) |  | (269 | ) |  | (1,632 | )
Balance as of December 31, 2015 | 644,617 |  |  | 230,289 |  |  | 874,906 |
Translation adjustment | 355 |  |  | 396 |  |  | 751 |
Balance as of March 31, 2016 | $ | 644,972 |  |  | $ | 230,685 |  |  | $ | 875,657 |
Schedule of Acquired Intangible Assets | Acquired intangible assets consisted of the following (in thousands):
|  |  | As of March 31, 2016 |  | As of December 31, 2015
| Estimated Useful Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 2 - 10 years |  | $ | 196,780 |  |  | $ | 80,781 |  |  | $ | 115,999 |  |  | $ | 196,472 |  |  | $ | 74,640 |  |  | $ | 121,832 |
Contractor relationships | 2 - 5 years |  | 69,813 |  |  | 42,991 |  |  | 26,822 |  |  | 69,764 |  |  | 40,124 |  |  | 29,640 |
Non-compete agreements | 2 - 7 years |  | 10,889 |  |  | 3,626 |  |  | 7,263 |  |  | 10,874 |  |  | 3,163 |  |  | 7,711 |
In-use software | 6 years |  | 18,900 |  |  | 7,304 |  |  | 11,596 |  |  | 18,900 |  |  | 6,516 |  |  | 12,384 |
Favorable contracts | 5 years |  | 900 |  |  | 242 |  |  | 658 |  |  | 900 |  |  | 172 |  |  | 728 |
|  |  | 297,282 |  |  | 134,944 |  |  | 162,338 |  |  | 296,910 |  |  | 124,615 |  |  | 172,295 |
Not subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  |  | 245,761 |  |  | — |  |  | 245,761 |  |  | 245,630 |  |  | — |  |  | 245,630 |
Total |  |  | $ | 543,043 |  |  | $ | 134,944 |  |  | $ | 408,099 |  |  | $ | 542,540 |  |  | $ | 124,615 |  |  | $ | 417,925 |
Schedule of Estimated Future Amortization Expense | Estimated amortization expense for the remainder of this year, each of the next four years, and thereafter is as follows (in thousands):
2016 | $ | 29,515 |
2017 | 33,054 |
2018 | 28,928 |
2019 | 22,016 |
2020 | 14,515 |
Thereafter | 34,310 |
| $ | 162,338 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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