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Goodwill and Other Intangible Assets - Summary of Other Intangible Assets and Related Accumulated Amortization (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Acquisition intangibles, gross | $ 461,234 | $ 374,384
Accumulated amortization | (184,382) | (144,767)
Total intangibles, net | 276,852 | 229,617
Customer related intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquisition intangibles, gross | 238,219 | 179,789
Accumulated amortization | (78,120) | (63,274)
Acquired software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquisition intangibles, gross | 202,416 | 179,466
Accumulated amortization | (99,772) | (76,800)
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquisition intangibles, gross | 16,905 | 11,435
Accumulated amortization | (5,139) | (3,768)
Leases acquired |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquisition intangibles, gross | 3,694 | 3,694
Accumulated amortization | $ (1,351) | $ (925)

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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