Goodwill and Other Intangible Assets, Net - Components of Other Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total definite and indefinite life intangible assets, gross, excluding goodwill	$ 374,190	$ 51,715
Total gross definite life intangible assets	269,925	39,530
Accumulated Amortization	37,001	23,735
Total definite and indefinite life intangible assets, net, excluding goodwill	337,189	27,980
Net definite life intangible assets	$ 232,924	$ 15,795
Weighted-Average Remaining Life	15 years 2 months 12 days	2 years 2 months 12 days
Total indefinite life intangible assets	$ 104,265	$ 12,185
Patents [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	7,988	7,554
Accumulated Amortization	6,629	6,336
Net definite life intangible assets	$ 1,359	$ 1,218
Weighted-Average Remaining Life	2 years 8 months 12 days	2 years 3 months 18 days
Acquired Intangibles [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 258,017	$ 28,004
Accumulated Amortization	28,599	14,815
Net definite life intangible assets	$ 229,418	$ 13,189
Weighted-Average Remaining Life	15 years 3 months 18 days	2 years 1 month 6 days
Noncompete Agreements [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 1,790	$ 1,790
Accumulated Amortization	1,659	1,436
Net definite life intangible assets	$ 131	$ 354
Weighted-Average Remaining Life	3 months 18 days	9 months 18 days
All Other [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total gross definite life intangible assets	$ 2,130	$ 2,182
Accumulated Amortization	114	1,148
Net definite life intangible assets	$ 2,016	$ 1,034
Weighted-Average Remaining Life	7 years 9 months 18 days	4 years 2 months 12 days
Trade Names [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total indefinite life intangible assets	$ 102,765	$ 10,685
Horizon License [Member]
Schedule Of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items]
Total indefinite life intangible assets	$ 1,500	$ 1,500