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22. Segment information (Details 2)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Supplier A
      
Supplier accounting for more than 5% of Group's purchases 20% 10% 7%
Supplier B
      
Supplier accounting for more than 5% of Group's purchases 17% 17% 10%
Supplier C
      
Supplier accounting for more than 5% of Group's purchases 8% 11% 10%
Supplier D
      
Supplier accounting for more than 5% of Group's purchases 8% 7% 8%
Supplier E
      
Supplier accounting for more than 5% of Group's purchases 7% 6% 6%
Supplier F
      
Supplier accounting for more than 5% of Group's purchases 7% 6% 15%