Segment information (Details 2) (Revenue, Geographical concentration risk, Multi-currency processing services)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
APAC | Customer A
Revenue concentration
Concentration risk (as a percent)	63.00%	62.00%	63.00%
APAC | Customer I
Revenue concentration
Concentration risk (as a percent)		12.00%	13.00%
North America | Customer E
Revenue concentration
Concentration risk (as a percent)	25.00%	18.00%	11.00%
North America | Customer F
Revenue concentration
Concentration risk (as a percent)	32.00%	44.00%	54.00%
North America | Customer G
Revenue concentration
Concentration risk (as a percent)	11.00%	11.00%	21.00%
CEMEA | Customer C
Revenue concentration
Concentration risk (as a percent)	71.00%	97.00%	100.00%
CEMEA | Customer H
Revenue concentration
Concentration risk (as a percent)	28.00%