Schedule of Goodwill and Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill	$ 3,015,670	$ 2,877,301	$ 2,864,664
Intangible assets with indefinite lives	657,865	657,776
Intangible assets with definite lives, net	163,554	86,122
Goodwill and intangible assets	$ 3,837,089	$ 3,621,199

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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