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Goodwill and Identifiable Assets (Tables) | 12 Months Ended
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Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill for the years ended December 31, 2015 and 2014 are as follows (in thousands):
| Apex |  | Oxford |  | 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 | 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 |
Schedule of Acquired Intangible Assets | As of December 31, 2015 and 2014, the Company had the following acquired intangible assets (in thousands):
|  |  |  | 2015 |  | 2014
|  | 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 |  | $ | 196,472 |  |  | $ | 74,640 |  |  | $ | 121,832 |  |  | $ | 101,141 |  |  | $ | 53,434 |  |  | $ | 47,707 |
Contractor relationships |  | 2 - 5 years |  | 69,764 |  |  | 40,124 |  |  | 29,640 |  |  | 39,332 |  |  | 32,021 |  |  | 7,311 |
Non-compete agreements |  | 2 - 7 years |  | 10,874 |  |  | 3,163 |  |  | 7,711 |  |  | 3,654 |  |  | 1,922 |  |  | 1,732 |
Favorable contracts |  | 5 years |  | 900 |  |  | 172 |  |  | 728 |  |  | — |  |  | — |  |  | — |
In-use software |  | 6 years |  | 18,900 |  |  | 6,516 |  |  | 12,384 |  |  | 18,900 |  |  | 3,366 |  |  | 15,534 |
|  |  |  | 296,910 |  |  | 124,615 |  |  | 172,295 |  |  | 163,027 |  |  | 90,743 |  |  | 72,284 |
Not subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  |  |  | 245,630 |  |  | — |  |  | 245,630 |  |  | 178,325 |  |  | — |  |  | 178,325 |
Total |  |  |  | $ | 542,540 |  |  | $ | 124,615 |  |  | $ | 417,925 |  |  | $ | 341,352 |  |  | $ | 90,743 |  |  | $ | 250,609 |
Schedule of Estimated Future Amortization Expense | Estimated amortization for each of the next five years and thereafter are as follows (in thousands):
2016 | $ | 39,657 |
2017 | 33,029 |
2018 | 28,904 |
2019 | 22,008 |
2020 | 14,496 |
Thereafter | 34,201 |
| $ | 172,295 |

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