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GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Allocation of Acquisition Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Acquired Finite Lived Intangible Assets |  |  |
Goodwill | $ 838,428 | $ 840,117 | $ 753,718
Amortizable intangibles, Gross carrying amount | 623,428 | 616,051 |
Amortizable intangibles, Accumulated Amortization | 292,239 | 237,137 |
Customer related intangibles |  |  |
Acquired Finite Lived Intangible Assets |  |  |
Amortizable intangibles, Gross carrying amount | $ 322,619 | $ 321,019 |
Amortizable intangibles, Weighted Average Amortization Period | 16 years | 16 years |
Amortizable intangibles, Accumulated Amortization | $ 116,609 | $ 97,320 |
Acquired software |  |  |
Acquired Finite Lived Intangible Assets |  |  |
Amortizable intangibles, Gross carrying amount | $ 262,286 | $ 262,286 |
Amortizable intangibles, Weighted Average Amortization Period | 7 years | 7 years |
Amortizable intangibles, Accumulated Amortization | $ 162,378 | $ 130,416 |
Trade names |  |  |
Acquired Finite Lived Intangible Assets |  |  |
Amortizable intangibles, Gross carrying amount | $ 22,905 | $ 22,905 |
Amortizable intangibles, Weighted Average Amortization Period | 11 years | 11 years |
Amortizable intangibles, Accumulated Amortization | $ 9,366 | $ 7,205 |
Capitalized software development costs |  |  |
Acquired Finite Lived Intangible Assets |  |  |
Amortizable intangibles, Gross carrying amount | $ 10,581 | $ 4,804 |
Amortizable intangibles, Weighted Average Amortization Period | 5 years | 5 years |
Amortizable intangibles, Accumulated Amortization | $ 1,460 | $ 296 |
Leases acquired |  |  |
Acquired Finite Lived Intangible Assets |  |  |
Amortizable intangibles, Gross carrying amount | $ 5,037 | $ 5,037 |
Amortizable intangibles, Weighted Average Amortization Period | 9 years | 9 years |
Amortizable intangibles, Accumulated Amortization | $ 2,426 | $ 1,900 |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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