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Goodwill and Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2017 |  | $ | 177,090 |  |  | $ | (70,004 | ) |  | $ | 107,086 |
Business combinations |  |  | 47,727 |  |  |  | — |  |  |  | 47,727 |
Other |  |  | 653 |  |  |  | — |  |  |  | 653 |
December 31, 2017 |  |  | 225,470 |  |  |  | (70,004 | ) |  |  | 155,466 |
Business combinations |  |  | 17,023 |  |  |  | — |  |  |  | 17,023 |
Other |  |  | 560 |  |  |  | — |  |  |  | 560 |
December 31, 2018 |  | $ | 243,053 |  |  | $ | (70,004 | ) |  | $ | 173,049 |
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, |
|  | 2018 |  |  | 2017 |
|  | Gross |  |  |  |  |  | Net |  |  | Gross |  |  |  |  |  | Net |
|  | Carrying |  |  | Accumulated |  |  | Book |  |  | Carrying |  |  | Accumulated |  |  | Book |
|  | Amount |  |  | Amortization |  |  | Value |  |  | Amount |  |  | Amortization |  |  | Value |
Amortized intangibles: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  | $ | 148,635 |  |  | $ | 52,514 |  |  | $ | 96,121 |  |  | $ | 121,015 |  |  | $ | 38,651 |  |  | $ | 82,364 |
Covenants not-to-compete |  |  | 14,682 |  |  |  | 7,572 |  |  |  | 7,110 |  |  |  | 11,807 |  |  |  | 4,773 |  |  |  | 7,034 |
Trademarks and tradenames |  |  | 64,432 |  |  |  | 18,256 |  |  |  | 46,176 |  |  |  | 58,136 |  |  |  | 14,076 |  |  |  | 44,060 |
Backlog |  |  | 14,060 |  |  |  | 13,677 |  |  |  | 383 |  |  |  | 13,600 |  |  |  | 9,067 |  |  |  | 4,533 |
|  | $ | 241,809 |  |  | $ | 92,019 |  |  | $ | 149,790 |  |  | $ | 204,558 |  |  | $ | 66,567 |  |  | $ | 137,991 |
Schedule of Estimated Aggregate Annual Amortization | Remaining estimated aggregate annual amortization expense is as follows (in thousands):
2019 |  | $ | 23,250 |
2020 |  |  | 22,318 |
2021 |  |  | 21,012 |
2022 |  |  | 20,094 |
2023 |  |  | 17,183 |
Thereafter |  |  | 45,933 |

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