Components of Other Intangible Assets, Net (Detail) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, Gross Amount	$ 181,520,000	$ 180,457,000
Finite-lived intangible assets, Accumulated Amortization	(64,042,000)	(54,485,000)
Finite-lived intangible assets, Net Amount	117,478,000	125,972,000
Indefinite-lived intangible assets, Net Amount	103,925,000	87,641,000
Other intangible assets, Net Amount	221,403,000	213,613,000
Indefinite-lived Intangible Assets, Period Increase (Decrease)	16,300,000
Mailing lists, non compete agreements and other
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, Gross Amount	41,520,000	40,457,000
Finite-lived intangible assets, Accumulated Amortization	(11,498,000)	(9,894,000)
Finite-lived intangible assets, Net Amount	30,022,000	30,563,000
Weighted average remaining useful life	14 years 1 month	15 years 1 month
Customer relationships
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, Gross Amount	140,000,000	140,000,000
Finite-lived intangible assets, Accumulated Amortization	(52,544,000)	(44,591,000)
Finite-lived intangible assets, Net Amount	$ 87,456,000	$ 95,409,000
Weighted average remaining useful life	8 years 2 months	9 years