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Goodwill and Identifiable Assets (Tables) | 6 Months Ended
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Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill for the year ended December 31, 2014 and the six months ended June 30, 2015 are as follows (in thousands):
| Apex Segment |  | Oxford Segment |  | Total
Balance as of December 31, 2013 | $ | 289,712 |  |  | $ | 224,714 |  |  | $ | 514,426 |
Translation adjustment | (1,761 | ) |  | (605 | ) |  | (2,366 | )
Balance as of December 31, 2014 | 287,951 |  |  | 224,109 |  |  | 512,060 |
Creative Circle Acquisition (see Note 3) | 361,746 |  |  | — |  |  | 361,746 |
LabResource Acquisition (see Note 3) | — |  |  | 6,104 |  |  | 6,104 |
Translation adjustment | (1,001 | ) |  | (47 | ) |  | (1,048 | )
Balance as of June 30, 2015 | $ | 648,696 |  |  | $ | 230,166 |  |  | $ | 878,862 |
Schedule of Acquired Intangible Assets | cquired intangible assets consisted of the following (in thousands):
|  |  | As of June 30, 2015 |  | As of December 31, 2014
| Estimated Useful Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Intangible assets subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 2 - 10 years |  | $ | 197,139 |  |  | $ | 60,661 |  |  | $ | 136,478 |  |  | $ | 101,141 |  |  | $ | 53,434 |  |  | $ | 47,707 |
Contractor relationships | 2 - 5 years |  | 69,790 |  |  | 34,490 |  |  | 35,300 |  |  | 39,332 |  |  | 32,021 |  |  | 7,311 |
Non-compete agreements | 2 - 7 years |  | 10,911 |  |  | 2,305 |  |  | 8,606 |  |  | 3,654 |  |  | 1,922 |  |  | 1,732 |
In-use software | 6 years |  | 18,900 |  |  | 4,941 |  |  | 13,959 |  |  | 18,900 |  |  | 3,366 |  |  | 15,534 |
Favorable contracts(1) | 5 years |  | 900 |  |  | 22 |  |  | 878 |  |  | — |  |  | — |  |  | — |
|  |  | 297,640 |  |  | 102,419 |  |  | 195,221 |  |  | 163,027 |  |  | 90,743 |  |  | 72,284 |
Intangible assets not subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  |  | 245,664 |  |  | — |  |  | 245,664 |  |  | 178,325 |  |  | — |  |  | 178,325 |
Total |  |  | $ | 543,304 |  |  | $ | 102,419 |  |  | $ | 440,885 |  |  | $ | 341,352 |  |  | $ | 90,743 |  |  | $ | 250,609 |
Schedule of Estimated Future Amortization Expense | Estimated amortization for the remainder of this year, each of the next four years and thereafter follows (in thousands):
2015 | $ | 22,740 |
2016 | 39,690 |
2017 | 33,058 |
2018 | 28,930 |
2019 | 22,031 |
Thereafter | 48,772 |
| $ | 195,221 |

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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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