Schedule of Goodwill and Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill	$ 7,992,941	$ 3,955,901	$ 3,663,674
Intangible assets with indefinite lives	1,459,854	976,638
Intangible assets with definite lives, net	1,334,100	313,449
Goodwill and intangible assets	$ 10,786,895	$ 5,245,988