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Goodwill and Identifiable Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill for the years ended December 31, 2017 and 2016 are as follows (in thousands):
| Apex |  | Oxford |  | Total
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 |
Stratacuity acquisition | 17,467 |  |  | — |  |  | 17,467 |
Translation adjustment |  |  |  | 3,115 |  |  | 3,115 |
Balance as of December 31, 2017 | $ | 662,084 |  |  | $ | 232,011 |  |  | $ | 894,095 |
Schedule of Acquired Intangible Assets | As of December 31, 2017 and 2016, the Company had the following acquired intangible assets (in thousands):
|  |  |  | 2017 |  | 2016
|  | 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 |  | $ | 202,588 |  |  | $ | 119,272 |  |  | $ | 83,316 |  |  | $ | 196,204 |  |  | $ | 98,804 |  |  | $ | 97,400 |
Contractor relationships |  | 2 - 5 years |  | 71,121 |  |  | 59,174 |  |  | 11,947 |  |  | 69,721 |  |  | 50,528 |  |  | 19,193 |
Non-compete agreements |  | 2 - 7 years |  | 11,850 |  |  | 6,600 |  |  | 5,250 |  |  | 10,861 |  |  | 4,922 |  |  | 5,939 |
In-use software |  | 6 years |  | 18,900 |  |  | 12,816 |  |  | 6,084 |  |  | 18,900 |  |  | 9,666 |  |  | 9,234 |
Favorable contracts |  | 5 years |  | 900 |  |  | 673 |  |  | 227 |  |  | 900 |  |  | 453 |  |  | 447 |
|  |  |  | 305,359 |  |  | 198,535 |  |  | 106,824 |  |  | 296,586 |  |  | 164,373 |  |  | 132,213 |
Not subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  |  |  | 245,942 |  |  | — |  |  | 245,942 |  |  | 245,517 |  |  | — |  |  | 245,517 |
Total |  |  |  | $ | 551,301 |  |  | $ | 198,535 |  |  | $ | 352,766 |  |  | $ | 542,103 |  |  | $ | 164,373 |  |  | $ | 377,730 |
Schedule of Estimated Future Amortization Expense | Estimated amortization for each of the next five years and thereafter follows (in thousands):
2018 | $ | 30,322 |
2019 | 23,287 |
2020 | 15,613 |
2021 | 12,753 |
2022 | 8,044 |
Thereafter | 16,805 |
| $ | 106,824 |

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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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