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GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Other Intangible Assets and Related Accumulated Amortization (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Gross carrying amount of other intangibles: |  |
Acquisition intangibles, gross | $ 623,428 | $ 616,051
Accumulated amortization | (292,239) | (237,137)
Total other intangibles, net | 331,189 | 378,914
Customer related intangibles |  |
Gross carrying amount of other intangibles: |  |
Acquisition intangibles, gross | 322,619 | 321,019
Accumulated amortization | (116,609) | (97,320)
Acquired software |  |
Gross carrying amount of other intangibles: |  |
Acquisition intangibles, gross | 262,286 | 262,286
Accumulated amortization | (162,378) | (130,416)
Trade names |  |
Gross carrying amount of other intangibles: |  |
Acquisition intangibles, gross | 22,905 | 22,905
Accumulated amortization | (9,366) | (7,205)
Capitalized software development costs |  |
Gross carrying amount of other intangibles: |  |
Acquisition intangibles, gross | 10,581 | 4,804
Accumulated amortization | (1,460) | (296)
Leases acquired |  |
Gross carrying amount of other intangibles: |  |
Acquisition intangibles, gross | 5,037 | 5,037
Accumulated amortization | $ (2,426) | $ (1,900)

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