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Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Balance Sheet) (Parenthetical) (Detail) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 300,000,000 300,000,000
Common stock, shares issued 93,185,023 92,483,393
Common stock, shares outstanding 93,122,353 92,460,914
Treasury stock Shares 62,670 22,479
Parent/Issuer [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 300,000,000 300,000,000
Common stock, shares issued 93,185,023 92,483,393
Common stock, shares outstanding 93,122,353 92,460,914
Treasury stock Shares 62,670 22,479