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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 Other Intangible Assets and Related Accumulated Amortization | Other intangible assets and related accumulated amortization consists of the following at December 31:
| 2017 |  | 2016
Gross carrying amount of acquisition intangibles: |  |  |
Customer related intangibles | $ | 187,717 |  |  | $ | 186,231 |
Acquired software | 179,466 |  |  | 176,096 |
Trade names | 11,435 |  |  | 11,065 |
Leases acquired | 3,694 |  |  | 3,694 |
| 382,312 |  |  | 377,086 |
Accumulated amortization | (145,868 | ) |  | (109,827 | )
Total intangibles, net | $ | 236,444 |  |  | $ | 267,259 |
Summary of Allocation of Acquisition Intangible Assets | The allocation of acquisition intangible assets is summarized in the following table:
| December 31, 2017 |  | December 31, 2016
| Gross Carrying Amount |  | Weighted Average Amortization Period |  | Accumulated Amortization |  | Gross Carrying Amount |  | Weighted Average Amortization Period |  | Accumulated Amortization
Non-amortizable intangibles: |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ | 657,987 |  |  | — |  |  | $ | — |  |  | $ | 650,237 |  |  | — |  |  | $ | — |
Amortizable intangibles: |  |  |  |  |  |  |  |  |  |  |
Customer related intangibles | 187,717 |  |  | 15 years |  |  | 64,375 |  |  | 186,231 |  |  | 15 years |  |  | 51,491 |
Acquired software | 179,466 |  |  | 7 years |  |  | 76,800 |  |  | 176,096 |  |  | 7 years |  |  | 55,115 |
Trade names | 11,435 |  |  | 11 years |  |  | 3,768 |  |  | 11,065 |  |  | 12 years |  |  | 2,740 |
Leases acquired | 3,694 |  |  | 10 years |  |  | 925 |  |  | 3,694 |  |  | 9 years |  |  | 481 |
Summary of Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the two years ended December 31, 2017 are as follows:
| Enterprise Software |  | Appraisal and Tax |  | Total
Balance as of 12/31/2015 | $ | 647,109 |  |  | $ | 6,557 |  |  | $ | 653,666 |
Goodwill acquired with acquisitions | 3,943 |  |  | — |  |  | 3,943 |
Purchase price adjustments related to purchase of NWS | (7,372 | ) |  | — |  |  | (7,372 | )
Balance as of 12/31/2016 | 643,680 |  |  | 6,557 |  |  | 650,237 |
Goodwill acquired with acquisitions | 7,750 |  |  | — |  |  | 7,750 |
Balance as of 12/31/2017 | $ | 651,430 |  |  | $ | 6,557 |  |  | $ | 657,987 |
Summary of Estimated Annual Amortization Expense | Estimated annual amortization expense related to acquisition intangibles, including acquired software, for which the amortization expense is recorded as cost of revenues, is as follows:
2018 | $ | 35,278 |
2019 | 33,920 |
2020 | 32,495 |
2021 | 32,136 |
2022 | 28,665 |

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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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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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- 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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