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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Acquired Finite Lived Intangible Assets [Line Items]
Goodwill	$ 753,718	$ 657,987	$ 650,237
Amortizable intangibles, Gross carrying amount	461,234	374,384
Amortizable intangibles, Accumulated Amortization	184,382	144,767
Customer related intangibles
Acquired Finite Lived Intangible Assets [Line Items]
Amortizable intangibles, Gross carrying amount	$ 238,219	$ 179,789
Amortizable intangibles, Weighted Average Amortization Period	15 years	15 years
Amortizable intangibles, Accumulated Amortization	$ 78,120	$ 63,274
Acquired software
Acquired Finite Lived Intangible Assets [Line Items]
Amortizable intangibles, Gross carrying amount	$ 202,416	$ 179,466
Amortizable intangibles, Weighted Average Amortization Period	7 years	7 years
Amortizable intangibles, Accumulated Amortization	$ 99,772	$ 76,800
Trade name
Acquired Finite Lived Intangible Assets [Line Items]
Amortizable intangibles, Gross carrying amount	$ 16,905	$ 11,435
Amortizable intangibles, Weighted Average Amortization Period	11 years	11 years
Amortizable intangibles, Accumulated Amortization	$ 5,139	$ 3,768
Leases acquired
Acquired Finite Lived Intangible Assets [Line Items]
Amortizable intangibles, Gross carrying amount	$ 3,694	$ 3,694
Amortizable intangibles, Weighted Average Amortization Period	10 years	10 years
Amortizable intangibles, Accumulated Amortization	$ 1,351	$ 925

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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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