Variable Interest Entity (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended		6 Months Ended	12 Months Ended			6 Months Ended	12 Months Ended
	Sep. 30, 2009	Jan. 20, 2009	Jun. 30, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009 V I E - Valuation [Member]	Jun. 30, 2012 Shanghai Runjie Management Consulting Company, ("R And J") [Member]	Dec. 31, 2011 Shanghai Runjie Management Consulting Company, ("R And J") [Member]
Variable Interest Entity [Line Items]
Initial equity contribution		$ 1,337		$ 2,296	$ 31
Variable interest entity, ownership interest		46.00%	49.00%
Additional ownership percentage acquired				1.00%	1.00%
Variable interest entity financing	160		307
Valuation of variable interest entity			Following the formation of the variable interest entity, the Company completed a valuation of the variable interest entity, which resulted in the recording of net tangible assets, intangible assets and goodwill of $314, $1,100 and $1,512, respectively in the consolidated balance sheet.
Net tangible assets						314
Intangible assets, net			83,732	73,074		1,100
Goodwill			67,343	43,265		1,512
Accretion associated with noncontrolling interest (variable interest entity)				$ (3,159)			$ 4,804	$ 4,990
R and J's ownership interest							51.00%