Goodwill and Other Intangible Assets - Summary of Other Intangible Assets and Related Accumulated Amortization (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	$ 616,051	$ 461,234
Accumulated amortization	(237,137)	(184,382)
Total other intangibles, net	378,914	276,852
Customer related intangibles
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	321,019	238,219
Accumulated amortization	(97,320)	(78,120)
Acquired software
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	262,286	202,416
Accumulated amortization	(130,416)	(99,772)
Trade names
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	22,905	16,905
Accumulated amortization	(7,205)	(5,139)
Capitalized software development costs
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	4,804	0
Accumulated amortization	(296)	0
Leases acquired
Finite-Lived Intangible Assets [Line Items]
Acquisition intangibles, gross	5,037	3,694
Accumulated amortization	$ (1,900)	$ (1,351)

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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