Restatement Of Condensed Consolidated Financial Statements (Condensed Consolidated Balance Sheet) (Parenthetical) (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 Restated	Dec. 31, 2010 Restated
Schedule of Condensed Consolidating Balance Sheets [Line Items]
Accounts receivable, allowance for doubtful accounts	$ 25,250	$ 24,510	$ 24,510	$ 20,863
Common Stock, par value	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Common Stock, shares authorized	120,000,000	120,000,000	120,000,000	120,000,000
Common Stock, shares issued	76,047,506	72,740,302	72,740,302	70,752,670
Common Stock, shares outstanding	76,047,506	72,740,302	72,740,302
Treasury Stock at cost, shares	246,037	246,037	246,037	246,037