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Goodwill and Identifiable Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill for the years ended December 31, 2016 and 2015 are as follows (in thousands):
| Apex |  | Oxford |  | 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 | — |  |  | (1,393 | ) |  | (1,393 | )
Balance as of December 31, 2016 | $ | 644,617 |  |  | $ | 228,896 |  |  | $ | 873,513 |
Schedule of Acquired Intangible Assets | As of December 31, 2016 and 2015, the Company had the following acquired intangible assets (in thousands):
|  |  |  | 2016 |  | 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 |  | $ | 196,204 |  |  | $ | 98,804 |  |  | $ | 97,400 |  |  | $ | 196,472 |  |  | $ | 74,640 |  |  | $ | 121,832 |
Contractor relationships |  | 2 - 5 years |  | 69,721 |  |  | 50,528 |  |  | 19,193 |  |  | 69,764 |  |  | 40,124 |  |  | 29,640 |
Non-compete agreements |  | 2 - 7 years |  | 10,861 |  |  | 4,922 |  |  | 5,939 |  |  | 10,874 |  |  | 3,163 |  |  | 7,711 |
In-use software |  | 6 years |  | 18,900 |  |  | 9,666 |  |  | 9,234 |  |  | 18,900 |  |  | 6,516 |  |  | 12,384 |
Favorable contracts |  | 5 years |  | 900 |  |  | 453 |  |  | 447 |  |  | 900 |  |  | 172 |  |  | 728 |
|  |  |  | 296,586 |  |  | 164,373 |  |  | 132,213 |  |  | 296,910 |  |  | 124,615 |  |  | 172,295 |
Not subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  |  |  | 245,517 |  |  | — |  |  | 245,517 |  |  | 245,630 |  |  | — |  |  | 245,630 |
Total |  |  |  | $ | 542,103 |  |  | $ | 164,373 |  |  | $ | 377,730 |  |  | $ | 542,540 |  |  | $ | 124,615 |  |  | $ | 417,925 |
Schedule of Estimated Future Amortization Expense | Estimated amortization for each of the next five years and thereafter follows (in thousands):
2017 | $ | 32,982 |
2018 | 28,859 |
2019 | 21,976 |
2020 | 14,468 |
2021 | 11,759 |
Thereafter | 22,169 |
| $ | 132,213 |

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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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