Clients and other receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Clients and other receivables [Abstract]
Trade receivables	$ 186,728	$ 151,199
Tax receivables	39,607	29,705
Prepayments	6,375	10,261
Other accounts receivable	11,739	16,456
Clients and other receivables	244,449	207,621
Up to 3 Months [Member]
Clients and other receivables [Abstract]
Trade receivables	186,728	151,199
Euros [Member]
Clients and other receivables [Abstract]
Trade receivables	109,165	98,798
Rand [Member]
Clients and other receivables [Abstract]
Trade receivables	23,792	12,807
Other [Member]
Clients and other receivables [Abstract]
Trade receivables	7,363	7,151
All Foreign Currencies [Member]
Clients and other receivables [Abstract]
Trade receivables	$ 140,320	$ 118,756

The amount of current prepayments. [Refer: Prepayments]

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- Definition

The amount of current receivables from taxes other than income tax. [Refer: Receivables from taxes other than income tax]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

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- Definition

The amount of current trade receivables. [Refer: Trade receivables]

+ References

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+ Details

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- References

No definition available.

+ Details

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- Definition

The amount of current other receivables. [Refer: Other receivables]

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of current trade receivables and current other receivables. [Refer: Current trade receivables; Other current receivables]

+ References

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+ Details

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- Details

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- Details

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- Details

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