Summary of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended						6 Months Ended
	Jun. 30, 2014		Jun. 30, 2014 U.S. Operating Segment		Dec. 31, 2013 U.S. Operating Segment		Jun. 30, 2014 International Operating Segment
Goodwill [Line Items]
Beginning Balance	$ 1,288,090	[1]	$ 1,150,471	[1]	$ 1,150,471	[1]	$ 137,619	[1]
Foreign currency translation adjustments	(1,401)						(1,401)
Ending Balance	$ 1,286,689	[1]	$ 1,150,471	[1]	$ 1,150,471	[1]	$ 136,218	[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.