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Goodwill and Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Change in Carrying Amount of Goodwill | The change in carrying amount of goodwill was as follows (in thousands):
|  | Goodwill (Gross) |  |  | Accumulated Impairment Losses |  |  | Goodwill (Net) |
January 1, 2016 |  | $ | 160,516 |  |  | $ | (70,004 | ) |  | $ | 90,512 |
Business combinations |  |  | 16,918 |  |  |  | — |  |  |  | 16,918 |
Other |  |  | (344 | ) |  |  | — |  |  |  | (344 | )
December 31, 2016 |  |  | 177,090 |  |  |  | (70,004 | ) |  |  | 107,086 |
Business combinations |  |  | 47,727 |  |  |  | — |  |  |  | 47,727 |
Other |  |  | 653 |  |  |  | — |  |  |  | 653 |
December 31, 2017 |  | $ | 225,470 |  |  | $ | (70,004 | ) |  | $ | 155,466 |
Schedule of Gross Carrying Amount, Accumulated Amortization and Net Book Value | The following table provides the gross carrying amount, accumulated amortization and net book value for each major class of intangibles (in thousands):
|  | As of December 31, |
|  | 2017 |  |  | 2016 |
|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Book Value |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Book Value |
Amortized intangibles: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 121,015 |  |  | $ | 38,651 |  |  | $ | 82,364 |  |  | $ | 80,909 |  |  | $ | 27,533 |  |  | $ | 53,376 |
Covenants not-to-compete |  |  | 11,807 |  |  |  | 4,773 |  |  |  | 7,034 |  |  |  | 8,602 |  |  |  | 2,466 |  |  |  | 6,136 |
Trademarks and tradenames |  |  | 58,136 |  |  |  | 14,076 |  |  |  | 44,060 |  |  |  | 37,303 |  |  |  | 10,498 |  |  |  | 26,805 |
Backlog |  |  | 13,600 |  |  |  | 9,067 |  |  |  | 4,533 |  |  |  | — |  |  |  | — |  |  |  | — |
|  | $ | 204,558 |  |  | $ | 66,567 |  |  | $ | 137,991 |  |  | $ | 126,814 |  |  | $ | 40,497 |  |  | $ | 86,317 |
Schedule of Estimated Aggregate Annual Amortization | Remaining estimated aggregate annual amortization expense is as follows (in thousands):
2018 |  | $ | 23,516 |
2019 |  |  | 18,387 |
2020 |  |  | 17,671 |
2021 |  |  | 16,653 |
2022 |  |  | 15,735 |
Thereafter |  |  | 46,029 |

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