Components of Other Intangible Assets, Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, Gross Amount	$ 180,457	$ 180,457
Finite-lived intangible assets, Accumulated Amortization	(57,641)	(54,485)
Finite-lived intangible assets, Net Amount	122,816	125,972
Indefinite-lived intangible assets, Net Amount	87,641	87,641
Other intangible assets, Net Amount	210,457	213,613
Mailing lists, non compete agreements and other
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, Gross Amount	40,457	40,457
Finite-lived intangible assets, Accumulated Amortization	(10,399)	(9,894)
Finite-lived intangible assets, Net Amount	30,058	30,563
Weighted average remaining useful life	14.9	15.1
Customer relationships
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, Gross Amount	140,000	140,000
Finite-lived intangible assets, Accumulated Amortization	(47,242)	(44,591)
Finite-lived intangible assets, Net Amount	$ 92,758	$ 95,409
Weighted average remaining useful life	8.7	9.0