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Goodwill and Identifiable Assets (Tables) | 3 Months Ended
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Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill for three months ended March 31, 2018 and the year ended December 31, 2017 were as follows (in thousands):
| Apex Segment |  | Oxford Segment |  | Total
Balance as of December 31, 2016 | $ | 644,617 |  |  | $ | 228,896 |  |  | $ | 873,513 |
Stratacuity acquisition | 17,467 |  |  | — |  |  | 17,467 |
Translation adjustment | — |  |  | 3,115 |  |  | 3,115 |
Balance as of December 31, 2017 | 662,084 |  |  | 232,011 |  |  | 894,095 |
Translation adjustment | — |  |  | 793 |  |  | 793 |
Balance as of March 31, 2018 | $ | 662,084 |  |  | $ | 232,804 |  |  | $ | 894,888 |
Schedule of Acquired Intangible Assets | Acquired intangible assets consisted of the following (in thousands):
|  |  | March 31, 2018 |  | December 31, 2017
| 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 |  | $ | 202,800 |  |  | $ | 123,802 |  |  | $ | 78,998 |  |  | $ | 202,588 |  |  | $ | 119,272 |  |  | $ | 83,316 |
Contractor relationships | 2 - 5 years |  | 71,200 |  |  | 61,191 |  |  | 10,009 |  |  | 71,121 |  |  | 59,174 |  |  | 11,947 |
Non-compete agreements | 2 - 7 years |  | 11,908 |  |  | 7,013 |  |  | 4,895 |  |  | 11,850 |  |  | 6,600 |  |  | 5,250 |
In-use software | 6 years |  | 18,900 |  |  | 13,603 |  |  | 5,297 |  |  | 18,900 |  |  | 12,816 |  |  | 6,084 |
Favorable contracts | 5 years |  | 900 |  |  | 706 |  |  | 194 |  |  | 900 |  |  | 673 |  |  | 227 |
|  |  | 305,708 |  |  | 206,315 |  |  | 99,393 |  |  | 305,359 |  |  | 198,535 |  |  | 106,824 |
Not subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  |  | 245,977 |  |  | — |  |  | 245,977 |  |  | 245,942 |  |  | — |  |  | 245,942 |
Total |  |  | $ | 551,685 |  |  | $ | 206,315 |  |  | $ | 345,370 |  |  | $ | 551,301 |  |  | $ | 198,535 |  |  | $ | 352,766 |
Schedule of Estimated Future Amortization Expense | Estimated future amortization expense is as follows (in thousands):
Remainder of 2018 | $ | 22,765 |
2019 | 23,311 |
2020 | 15,633 |
2021 | 12,785 |
2022 | 8,060 |
Thereafter | 16,839 |
| $ | 99,393 |

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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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