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Note 2 - Acquisitions and Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Detail) - The following table summarizes the changes in the noncontrolling owners’ interests in subsidiaries a (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Balance, beginning of period $ 18,375 $ 28,724 $ 23,887
Net income attributable to noncontrolling interest included in liabilities 16,941 935 7,137
Net income attributable to noncontrolling interest included in equity 1,068 261  
Accretion of interest on puts 993 881 1,169
Issuance of noncontrolling interest in RHB in exchange for net assets of acquired companies 9,767    
Distributions to noncontrolling interests owners (10,185) (7,809) (4,160)
Acquisition by Sterling of RLW noncontrolling interest (23,144)    
Other (39) 39  
Balance, end of period 20,046 18,375 28,724
RLW [Member]
      
Change in fair value of Put/Call 3,797 1,268  
RHB [Member]
      
Change in fair value of Put/Call 2,473 1,054 691
Acquisition by Sterling of noncontrolling interest   (8,205)  
Myers [Member]
      
Acquisition by Sterling of noncontrolling interest   $ 1,227