Goodwill and Intangible Assets - Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Definite-lived intangibles:
Cost	$ 412,642	$ 415,323
Accumulated amortization	(297,923)	(291,741)
Net carrying amount	114,719	123,582
Indefinite-lived intangibles:
Cost	593,260	596,414
Net carrying amount	$ 295,337	$ 304,673
Customer relationships
Definite-lived intangibles:
Weighted average amortization period	14 years	14 years
Cost	$ 402,504	$ 404,667
Accumulated amortization	(289,824)	(283,597)
Net carrying amount	$ 112,680	$ 121,070
Trade names
Definite-lived intangibles:
Weighted average amortization period	6 years	6 years
Cost	$ 10,138	$ 10,656
Accumulated amortization	(8,099)	(8,144)
Net carrying amount	2,039	2,512
Trade names
Indefinite-lived intangibles:
Net carrying amount		181,091
Indefinite-lived intangible assets	$ 180,618	$ 181,091