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Goodwill and Other Intangible Assets, Net of Accumulated Amortization (Tables) | 3 Months Ended
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Mar. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Summary of Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill the three months ended March 31, 2018 and the year ended December 31, 2017 were as follows (in thousands):
Balance at December 31, 2016 |  | $ | 412,846 |
Acquisitions |  |  | 64,291 |
Measurement period adjustments |  |  | 395 |
Balance at December 31, 2017 |  |  | 477,532 |
Acquisitions |  |  | — |
Measurement period adjustments |  |  | (2,542 | )
Balance at March 31, 2018 |  | $ | 474,990 |
Components of Other Intangible Assets | Other intangible assets consisted of the following at March 31, 2018 and December 31, 2017 (in thousands, except weighted average life):
|  | March 31, 2018 |
|  | Gross Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Weighted- Average Remaining Life (Years) |
Indefinite life: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademark and trade names |  | $ | 4,400 |  |  | $ | — |  |  | $ | 4,400 |  |  | N/A |
License agreements (GSE) |  |  | 5,390 |  |  |  | — |  |  |  | 5,390 |  |  | N/A |
Definite life: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademark and trade names |  |  | 7,061 |  |  |  | (6,183 | ) |  |  | 878 |  |  |  | 0.1 |
Non-contractual customers |  |  | 10,447 |  |  |  | (2,407 | ) |  |  | 8,040 |  |  |  | 2.5 |
License agreements |  |  | 4,981 |  |  |  | (1,548 | ) |  |  | 3,433 |  |  |  | 0.7 |
Non-compete agreements |  |  | 3,608 |  |  |  | (642 | ) |  |  | 2,966 |  |  |  | 1.1 |
Contractual customers |  |  | 1,452 |  |  |  | (664 | ) |  |  | 788 |  |  |  | 0.2 |
Below market leases |  |  | 15 |  |  |  | (14 | ) |  |  | 1 |  |  |  | — |
|  | $ | 37,354 |  |  | $ | (11,458 | ) |  | $ | 25,896 |  |  |  | 4.6 |
|  | December 31, 2017 |
|  | Gross Amount |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Weighted- Average Remaining Life (Years) |
Indefinite life: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademark and trade names |  | $ | 4,400 |  |  | $ | — |  |  | $ | 4,400 |  |  | N/A |
License agreements (GSE) |  |  | 5,390 |  |  |  | — |  |  |  | 5,390 |  |  | N/A |
Definite life: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademark and trade names |  |  | 7,061 |  |  |  | (6,030 | ) |  |  | 1,031 |  |  |  | 0.2 |
Non-contractual customers |  |  | 7,950 |  |  |  | (1,495 | ) |  |  | 6,455 |  |  |  | 2.5 |
License agreements |  |  | 4,981 |  |  |  | (1,298 | ) |  |  | 3,683 |  |  |  | 0.9 |
Non-compete agreements |  |  | 3,606 |  |  |  | (496 | ) |  |  | 3,110 |  |  |  | 1.2 |
Contractual customers |  |  | 1,452 |  |  |  | (602 | ) |  |  | 850 |  |  |  | 0.2 |
Below market leases |  |  | 15 |  |  |  | (13 | ) |  |  | 2 |  |  |  | — |
|  | $ | 34,855 |  |  | $ | (9,934 | ) |  | $ | 24,921 |  |  |  | 5.0 |
Estimated Future Amortization Expense of Definite Life Intangible Assets | The estimated future amortization of definite life intangible assets as of March 31, 2018 was as follows (in thousands):
2018 |  | $ | 3,047 |
2019 |  |  | 3,934 |
2020 |  |  | 3,691 |
2021 |  |  | 2,709 |
2022 and thereafter |  |  | 2,725 |
Total |  | $ | 16,106 |

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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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