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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Changes in Carrying Amounts of Goodwill by Operating Segment | The table below summarizes the changes in the carrying amount of goodwill by reportable segment.
| Corporate Finance & Restructuring |  | Forensic and Litigation Consulting |  | Economic Consulting |  | Technology |  | Strategic Communications |  | Total
Balance at December 31, 2015 |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ | 441,548 |  |  | $ | 235,211 |  |  | $ | 269,341 |  |  | $ | 117,888 |  |  | $ | 328,449 |  |  | $ | 1,392,437 |
Accumulated goodwill impairment | — |  |  | — |  |  | — |  |  | — |  |  | (194,139 | ) |  | (194,139 | )
Goodwill, net at December 31, 2015 | 441,548 |  |  | 235,211 |  |  | 269,341 |  |  | 117,888 |  |  | 134,310 |  |  | 1,198,298 |
Acquisitions (1) | — |  |  | — |  |  | — |  |  | — |  |  | 218 |  |  | 218 |
Foreign currency translation adjustment and other | (882 | ) |  | (4,667 | ) |  | (1,132 | ) |  | (281 | ) |  | (11,553 | ) |  | (18,515 | )
Balance at December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 440,666 |  |  | 230,544 |  |  | 268,209 |  |  | 117,607 |  |  | 317,114 |  |  | 1,374,140 |
Accumulated goodwill impairment | — |  |  | — |  |  | — |  |  | — |  |  | (194,139 | ) |  | (194,139 | )
Goodwill, net at December 31, 2016 | 440,666 |  |  | 230,544 |  |  | 268,209 |  |  | 117,607 |  |  | 122,975 |  |  | 1,180,001 |
Acquisitions (2) | 11,900 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 11,900 |
Foreign currency translation adjustment and other | 2,250 |  |  | 3,175 |  |  | 786 |  |  | 133 |  |  | 6,558 |  |  | 12,902 |
Balance at December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 454,816 |  |  | 233,719 |  |  | 268,995 |  |  | 117,740 |  |  | 323,672 |  |  | 1,398,942 |
Accumulated goodwill impairment | — |  |  | — |  |  | — |  |  | — |  |  | (194,139 | ) |  | (194,139 | )
Goodwill, net at December 31, 2017 | $ | 454,816 |  |  | $ | 233,719 |  |  | $ | 268,995 |  |  | $ | 117,740 |  |  | $ | 129,533 |  |  | $ | 1,204,803 |
(1) | Includes adjustments during the purchase price allocation period.
(2) | During the year ended December 31, 2017, we made an initial payment of $8.9 million at closing to acquire a restructuring business within our Corporate Finance & Restructuring segment. We recorded $11.9 million in goodwill as a result of the acquisition. We have included the results of the acquired business' operations in the Corporate Finance & Restructuring segment since its acquisition date.
Schedule of Other Intangible Assets Amortized Intangibles | Other intangible assets were as follows:
|  |  | December 31, 2017 |  | December 31, 2016
| Weighted Average Useful Life in Years |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Amortizing intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 13.7 |  | $ | 117,192 |  |  | $ | 80,523 |  |  | $ | 36,669 |  |  | $ | 119,736 |  |  | $ | 75,212 |  |  | $ | 44,524 |
Non-competition agreements (1) | N/A |  | — |  |  | — |  |  | — |  |  | 1,263 |  |  | 1,246 |  |  | 17 |
Acquired software | 9.8 |  | 3,264 |  |  | 1,383 |  |  | 1,881 |  |  | 3,171 |  |  | 1,292 |  |  | 1,879 |
Trade names (1) | N/A |  | — |  |  | — |  |  | — |  |  | 360 |  |  | 260 |  |  | 100 |
| 13.6 |  | 120,456 |  |  | 81,906 |  |  | 38,550 |  |  | 124,530 |  |  | 78,010 |  |  | 46,520 |
Non-amortizing intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names | Indefinite |  | 5,600 |  |  | — |  |  | 5,600 |  |  | 5,600 |  |  | — |  |  | 5,600 |
Total |  |  | $ | 126,056 |  |  | $ | 81,906 |  |  | $ | 44,150 |  |  | $ | 130,130 |  |  | $ | 78,010 |  |  | $ | 52,120 |
(1) | These intangible assets were fully amortized and written off during the year ended December 31, 2017.
Schedule of Other Intangible Assets Unamortized Intangibles | Other intangible assets were as follows:
|  |  | December 31, 2017 |  | December 31, 2016
| Weighted Average Useful Life in Years |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Amortizing intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 13.7 |  | $ | 117,192 |  |  | $ | 80,523 |  |  | $ | 36,669 |  |  | $ | 119,736 |  |  | $ | 75,212 |  |  | $ | 44,524 |
Non-competition agreements (1) | N/A |  | — |  |  | — |  |  | — |  |  | 1,263 |  |  | 1,246 |  |  | 17 |
Acquired software | 9.8 |  | 3,264 |  |  | 1,383 |  |  | 1,881 |  |  | 3,171 |  |  | 1,292 |  |  | 1,879 |
Trade names (1) | N/A |  | — |  |  | — |  |  | — |  |  | 360 |  |  | 260 |  |  | 100 |
| 13.6 |  | 120,456 |  |  | 81,906 |  |  | 38,550 |  |  | 124,530 |  |  | 78,010 |  |  | 46,520 |
Non-amortizing intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names | Indefinite |  | 5,600 |  |  | — |  |  | 5,600 |  |  | 5,600 |  |  | — |  |  | 5,600 |
Total |  |  | $ | 126,056 |  |  | $ | 81,906 |  |  | $ | 44,150 |  |  | $ | 130,130 |  |  | $ | 78,010 |  |  | $ | 52,120 |
(1) | These intangible assets were fully amortized and written off during the year ended December 31, 2017.
Schedule of Future Amortization Expense Intangible Assets | We estimate our future amortization expense for our intangible assets with a finite life to be as follows:
| As of December 31, 2017 (1)
Year
2018 | $ | 8,252 |
2019 | 7,589 |
2020 | 7,413 |
2021 | 6,797 |
2022 | 4,973 |
Thereafter | 3,526 |
| $ | 38,550 |
(1) | Actual amortization expense to be reported in future periods could differ from these estimates as a result of new intangible asset acquisitions, changes in useful lives, or other relevant factors or changes.

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