Other Intangible Assets, Net - Carrying Amount of Other Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Gross amount	$ 699,667	$ 665,489
Accumulated amortization	(457,730)	(406,220)
Net carrying amount	241,937	259,269
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross amount	344,883	342,738
Accumulated amortization	(220,434)	(194,570)
Net carrying amount	$ 124,449	$ 148,168
Customer relationships | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	8 years	8 years
Customer relationships | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	14 years	14 years
Trademark
Acquired Finite-Lived Intangible Assets [Line Items]
Gross amount	$ 42,025	$ 41,357
Accumulated amortization	(32,456)	(28,888)
Net carrying amount	$ 9,569	$ 12,469
Trademark | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	2 years	2 years
Trademark | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	15 years	15 years
Software packages
Acquired Finite-Lived Intangible Assets [Line Items]
Gross amount	$ 256,220	$ 224,855
Accumulated amortization	(169,974)	(151,666)
Net carrying amount	$ 86,246	$ 73,189
Software packages | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	3 years	3 years
Software packages | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	10 years	10 years
Non-compete agreement
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life in years	15 years	15 years
Gross amount	$ 56,539	$ 56,539
Accumulated amortization	(34,866)	(31,096)
Net carrying amount	$ 21,673	$ 25,443