Restatement Of Consolidated Financial Statements (Schedule Of Errors Corrections On Consolidated Balance Sheet Statement) (Parenthetical) (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
As Reported [Member]
Accounts receivable, allowance for doubtful accounts	$ 23,112	$ 20,357
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	120,000,000	120,000,000
Common Stock, shares issued	72,740,302	70,752,670	69,411,845
Common Stock, shares outstanding	72,740,302
Treasury Stock, shares	246,037	246,037	246,037
Restated [Member]
Accounts receivable, allowance for doubtful accounts	$ 24,510	$ 20,863
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	120,000,000	120,000,000
Common Stock, shares issued	72,740,302	70,752,670
Common Stock, shares outstanding	72,740,302	70,752,670
Treasury Stock, shares	246,037	246,037