Debt (Schedule Of Interest Expense, Net, Details) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Interest expense, net	$ 37,376,000	$ 34,466,000	$ 29,178,000
Segment, Continuing Operations [Member]
Debt Instrument [Line Items]
Contractual and other interest expense	27,500,000	26,100,000	26,600,000
Accretion of senior convertible note discount	4,900,000	4,200,000	0
Deferred financing costs and commitment fees	5,400,000	4,700,000	3,600,000
Total interest expense	37,800,000	35,000,000	30,200,000
Interest income	(400,000)	(500,000)	(1,000,000)
Interest expense, net	$ 37,376,000	$ 34,466,000	$ 29,178,000