Goodwill and Other Intangible Assets, Net - Components of Other Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 286,837	$ 192,963
Accumulated Amortization	65,865	43,126
Net definite life intangible assets	$ 220,972	$ 149,837
Weighted-Average Remaining Life	12 years 2 months 12 days	14 years 4 months 24 days
Total indefinite life intangible assets	$ 91,889	$ 103,326
Total definite and indefinite life intangible assets, gross, excluding goodwill	378,726	296,289
Total definite and indefinite life intangible assets, net, excluding goodwill	312,861	253,163
Trade Names [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total indefinite life intangible assets	83,960	96,436
Licenses [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total indefinite life intangible assets	7,929	6,890
Customer-Related Intangible Assets [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	200,273	127,749
Accumulated Amortization	24,326	14,386
Net definite life intangible assets	$ 175,947	$ 113,363
Weighted-Average Remaining Life	14 years 1 month 6 days	17 years 8 months 12 days
Technology [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 24,024	$ 24,570
Accumulated Amortization	8,874	6,275
Net definite life intangible assets	$ 15,150	$ 18,295
Weighted-Average Remaining Life	4 years 4 months 24 days	5 years 2 months 12 days
Noncompete Agreements [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 31,584	$ 16,478
Accumulated Amortization	13,817	7,597
Net definite life intangible assets	$ 17,767	$ 8,881
Weighted-Average Remaining Life	2 years 4 months 25 days	2 years 8 months 12 days
Patents [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 10,596	$ 10,300
Accumulated Amortization	9,785	8,432
Net definite life intangible assets	$ 811	$ 1,868
Weighted-Average Remaining Life	3 years 1 month 6 days	1 year 8 months 12 days
All Other [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 20,360	$ 13,866
Accumulated Amortization	9,063	6,436
Net definite life intangible assets	$ 11,297	$ 7,430
Weighted-Average Remaining Life	8 years 7 months 6 days	3 years 8 months 12 days