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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
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)