Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended						3 Months Ended
	Mar. 31, 2013		Mar. 31, 2013 U.S. Operating Segment		Dec. 31, 2012 U.S. Operating Segment		Mar. 31, 2013 International Operating Segment
Goodwill [Line Items]
Beginning Balance	$ 1,150,811	[1]	$ 956,997	[1]	$ 956,997	[1]	$ 193,814	[1]
Foreign currency translation adjustments	684						684
Ending Balance	$ 1,151,495	[1]	$ 956,997	[1]	$ 956,997	[1]	$ 194,498	[1]

[1] Balances are presented net of accumulated impairment losses of $214,031 for the U.S. operating segment and $27,622 for the international operating segment.