Goodwill and Intangible Assets - Amortization Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets amortization expense	$ 8,300	$ 2,800	$ 22,000	$ 8,300
Estimated annual intangible assets amortization expense 2015	30,318		30,318
Estimated annual intangible assets amortization expense 2016	29,372		29,372
Estimated annual intangible assets amortization expense 2017	24,950		24,950
Estimated annual intangible assets amortization expense 2018	14,660		14,660
Estimated annual intangible assets amortization expense 2019	9,241		9,241
Estimated annual intangible assets amortization expense 2020	$ 5,664		$ 5,664