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Acquisition (Tables)
3 Months Ended
Mar. 31, 2013
Acquisition [Abstract]  
Reconciliation Of Total Redeemable Equity
    March 31,   December 31,  
Changes in fair value during the period ended:   2013   2012  
Beginning balance at January 1 $ 493,861 $ 0  
Redeemable noncontrolling interest resulting from subsidiary purchase   0   446,250  
Net income attributable to redeemable noncontrolling interest   9,688   88,411  
Distributions to noncontrolling interest   0   (40,800 )
Balance, net $ 503,549 $ 493,861