Reconciliation Of Adjusted Segment EBITDA (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Segment Reporting Information [Line Items]
Total Adjusted Segment EBITDA	$ 79,780	[1]	$ 92,306	[1]	$ 237,937	[1]	$ 240,453	[1]
Segment depreciation expense	(6,038)		(6,115)		(18,646)		(17,729)
Amortization of other intangible assets	(5,766)		(5,843)		(16,773)		(16,795)
Special Charges	(2,775)				(29,557)		(15,212)
Unallocated corporate expenses, excluding special charges	(18,613)		(20,926)		(58,594)		(53,474)
Interest income and other	1,584		486		4,503		5,409
Interest expense	(13,208)		(14,319)		(43,607)		(44,129)
Income before income tax provision	$ 34,964		$ 45,589		$ 75,263		$ 98,523

[1] Total Adjusted Segment EBITDA is the total of Adjusted Segment EBITDA for all segments.