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Earnings (Loss) Per Share of Class A and Class B Common Stock Schedule of Basic and Diluted Net Loss Per Share for Common Stock (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net (loss) income $ (940) $ (14,416) $ 29,016 $ (238,083)
Redemption of preferred stock in excess of carrying value 0 0 0 (34,327)
Adjustment of redeemable noncontrolling interests to redemption value (1,333) (43,656) (12,498) (59,307)
Net loss (income) attributable to noncontrolling interests 706 (3,843) 2,806 (23,602)
Net (loss) income attributable to common stockholders $ (2,979) $ (54,229) $ 13,712 $ (308,115)
Weighted-average shares outstanding for basic and diluted net loss per share   307,605,060 [1]   305,288,502 [1]
Basic and diluted net loss per share   $ (0.18)   $ (1.01)
[1] Stock options, restricted stock units, performance stock units and convertible preferred shares are not included in the calculation of diluted net loss per share for the three and nine months ended September 30, 2011 because the Company had a net loss for each period. Accordingly, the inclusion of these equity awards would have had an antidilutive effect on the calculation of diluted loss per share.