Loss Per Share of Class A and Class B Common Stock Basic and Diluted Earnings Per Share, 2013 (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Earnings Per Share, Basic [Abstract]
Net (loss) income	$ (1,292)		$ (940)		$ (10,085)		$ 29,016
Adjustment of redeemable noncontrolling interests to redemption value	0		1,333		0		12,498
Net income attributable to noncontrolling interests	1,288		706		4,061		2,806
Net (loss) income attributable to common stockholders	(2,580)		(2,979)		(14,146)		13,712
Basic, weighted average number of shares outstanding	666,432,848		653,223,610		662,531,567		648,021,943
Basic, net (loss) earnings per share	$ 0.00		$ 0.00		$ (0.02)		$ 0.02
Earnings Per Share, Diluted [Abstract]
Net (loss) income attributable to common stockholders	(2,580)		(2,979)		(14,146)		13,712
Basic, weighted average number of shares outstanding	666,432,848		653,223,610		662,531,567		648,021,943
Diluted, weighted average number of shares outstanding	666,432,848		653,223,610		662,531,567		663,557,250
Diluted, net (loss) earnings per share	$ 0.00		$ 0.00		$ (0.02)		$ 0.02
Common Class A [Member]
Earnings Per Share, Basic [Abstract]
Net (loss) income	(1,287)		(937)		(10,049)		28,908
Adjustment of redeemable noncontrolling interests to redemption value	0		1,328		0		12,452
Net income attributable to noncontrolling interests	1,283		703		4,046		2,796
Net (loss) income attributable to common stockholders	(2,570)		(2,968)		(14,095)		13,660
Basic, weighted average number of shares outstanding	664,032,872		650,823,634		660,131,591		645,621,967
Basic, net (loss) earnings per share	$ 0.00		$ 0.00		$ (0.02)		$ 0.02
Earnings Per Share, Diluted [Abstract]
Net (loss) income attributable to common stockholders	(2,570)		(2,968)		(14,095)		13,660
Reallocation of net income attributable to common stockholders as a result of conversion of Class B	0	[1]	0	[1]	0	[1]	52	[1]
Allocation of net income attributable to common stockholders	(2,570)		(2,968)		(14,095)		13,712
Basic, weighted average number of shares outstanding	664,032,872		650,823,634		660,131,591		645,621,967
Conversion of Class B	0	[1]	0	[1]	0	[1]	2,399,976	[1]
Employee stock options	0	[1]	0	[1]	0	[1]	10,909,749	[1]
Restricted shares and RSUs	0	[1]	0	[1]	0	[1]	4,625,558	[1]
Diluted, weighted average number of shares outstanding	664,032,872	[1]	650,823,634	[1]	660,131,591	[1]	663,557,250	[1]
Diluted, net (loss) earnings per share	$ 0.00		$ 0.00		$ (0.02)		$ 0.02
Common Class B [Member]
Earnings Per Share, Basic [Abstract]
Net (loss) income	(5)		(3)		(36)		108
Adjustment of redeemable noncontrolling interests to redemption value	0		5		0		46
Net income attributable to noncontrolling interests	5		3		15		10
Net (loss) income attributable to common stockholders	(10)		(11)		(51)		52
Basic, weighted average number of shares outstanding	2,399,976		2,399,976		2,399,976		2,399,976
Basic, net (loss) earnings per share	$ 0.00		$ 0.00		$ (0.02)		$ 0.02
Earnings Per Share, Diluted [Abstract]
Net (loss) income attributable to common stockholders	(10)		(11)		(51)		52
Reallocation of net income attributable to common stockholders as a result of conversion of Class B	0	[1]	0	[1]	0	[1]	0	[1]
Allocation of net income attributable to common stockholders	$ (10)		$ (11)		$ (51)		$ 52
Basic, weighted average number of shares outstanding	2,399,976		2,399,976		2,399,976		2,399,976
Conversion of Class B	0	[1]	0	[1]	0	[1]	0	[1]
Employee stock options	0	[1]	0	[1]	0	[1]	0	[1]
Restricted shares and RSUs	0	[1]	0	[1]	0	[1]	0	[1]
Diluted, weighted average number of shares outstanding	2,399,976	[1]	2,399,976	[1]	2,399,976	[1]	2,399,976	[1]
Diluted, net (loss) earnings per share	$ 0.00		$ 0.00		$ (0.02)		$ 0.02

[1] Conversion of Class B shares into Class A shares and outstanding equity awards have not been reflected in the diluted loss per share calculation for the three and nine months ended September 30, 2013 and for the three months ended September 30, 2012 because the effect would be antidilutive.