Net Carrying Values of Goodwill and Finite-Lived Identifiable intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 2,190,063	$ 1,303,055	$ 1,312,596
Identifiable definite-lived intangible assets, net	$ 569,114	$ 78,743

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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