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Goodwill and Identifiable Assets (Tables) | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill for the nine months ended September 30, 2018 and the year ended December 31, 2017 were as follows (in thousands):
| Apex Segment |  | Oxford Segment |  | ECS 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 |
ECS acquisition | — |  |  | — |  |  | 527,388 |  |  | 527,388 |
Translation adjustment | — |  |  | (847 | ) |  | — |  |  | (847 | )
Balance as of September 30, 2018 | $ | 662,084 |  |  | $ | 231,164 |  |  | $ | 527,388 |  |  | $ | 1,420,636 |
Schedule of Acquired Intangible Assets | Acquired intangible assets consisted of the following (in thousands):
|  |  | September 30, 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 and contractual relationships | 2 - 13 years |  | $ | 343,707 |  |  | $ | 135,739 |  |  | $ | 207,968 |  |  | $ | 202,588 |  |  | $ | 119,272 |  |  | $ | 83,316 |
Contractor relationships | 2 - 5 years |  | 71,121 |  |  | 65,102 |  |  | 6,019 |  |  | 71,121 |  |  | 59,174 |  |  | 11,947 |
Backlog | 1 year |  | 26,100 |  |  | 17,400 |  |  | 8,700 |  |  | — |  |  | — |  |  | — |
Non-compete agreements | 2 - 7 years |  | 22,234 |  |  | 8,950 |  |  | 13,284 |  |  | 11,850 |  |  | 6,600 |  |  | 5,250 |
In-use software | 6 years |  | 18,900 |  |  | 15,178 |  |  | 3,722 |  |  | 18,900 |  |  | 12,816 |  |  | 6,084 |
Favorable contracts | 5 years |  | 1,400 |  |  | 804 |  |  | 596 |  |  | 900 |  |  | 673 |  |  | 227 |
|  |  | 483,462 |  |  | 243,173 |  |  | 240,289 |  |  | 305,359 |  |  | 198,535 |  |  | 106,824 |
Not subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  |  | 262,268 |  |  | — |  |  | 262,268 |  |  | 245,942 |  |  | — |  |  | 245,942 |
Total |  |  | $ | 745,730 |  |  | $ | 243,173 |  |  | $ | 502,557 |  |  | $ | 551,301 |  |  | $ | 198,535 |  |  | $ | 352,766 |
Schedule of Estimated Future Amortization Expense | Estimated future amortization expense is as follows (in thousands):
Remainder of 2018 | $ | 18,545 |
2019 | 51,296 |
2020 | 40,287 |
2021 | 35,469 |
2022 | 24,437 |
Thereafter | 70,255 |
| $ | 240,289 |

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