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Borrowings and debt (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of short term borrowings [Line Items] |  |
Average outstanding balance during the year | $ 710,021 | $ 1,348,230
Maximum outstanding balance at any month - end | 1,072,723 | 1,876,322
Total short-term borrowings and debt | 1,072,723 | 1,470,075
Short-term borrowings [member] |  |
Disclosure of short term borrowings [Line Items] |  |
Total short-term borrowings and debt | 1,062,223 | 1,445,075
Short term debt [Member] |  |
Disclosure of short term borrowings [Line Items] |  |
Total short-term borrowings and debt | 10,500 | 25,000
US dollar [Member] |  |
Disclosure of short term borrowings [Line Items] |  |
Total short-term borrowings and debt | 1,044,500 | 1,470,000
Mexican peso [Member] |  |
Disclosure of short term borrowings [Line Items] |  |
Total short-term borrowings and debt | 28,223 | 75
Fixed interest rate [member] | Short-term borrowings [member] |  |
Disclosure of short term borrowings [Line Items] |  |
Total short-term borrowings and debt | 429,069 | 788,075
Fixed interest rate [member] | Short term debt [Member] |  |
Disclosure of short term borrowings [Line Items] |  |
Total short-term borrowings and debt | $ 10,500 | $ 25,000
Fixed interest rate [member] | Short term borrowings and debt [Member] | Mexican peso [Member] |  |
Disclosure of short term borrowings [Line Items] |  |
Borrowings, interest rate | 7.92% | 6.16%
Floating interest rate [member] | Short-term borrowings [member] |  |
Disclosure of short term borrowings [Line Items] |  |
Total short-term borrowings and debt | $ 633,154 | $ 657,000
Floating interest rate [member] | Short term debt [Member] |  |
Disclosure of short term borrowings [Line Items] |  |
Total short-term borrowings and debt | $ 0 | $ 0
Floating interest rate [member] | Short term borrowings and debt [Member] | Mexican peso [Member] |  |
Disclosure of short term borrowings [Line Items] |  |
Borrowings, interest rate |  | 5.72%
Bottom of range [member] | Fixed interest rate [member] | Short term borrowings and debt [Member] | US dollar [Member] |  |
Disclosure of short term borrowings [Line Items] |  |
Borrowings, interest rate | 1.60% | 1.10%
Bottom of range [member] | Floating interest rate [member] | Short term borrowings and debt [Member] | US dollar [Member] |  |
Disclosure of short term borrowings [Line Items] |  |
Borrowings, interest rate | 1.77% | 1.14%
Bottom of range [member] | Floating interest rate [member] | Short term borrowings and debt [Member] | Mexican peso [Member] |  |
Disclosure of short term borrowings [Line Items] |  |
Borrowings, interest rate | 7.68% |
Weighted Average [Member] | Short term borrowings and debt [Member] |  |
Disclosure of short term borrowings [Line Items] |  |
Borrowings, interest rate | 2.16% | 1.30%
Weighted Average [Member] | During the Year [Member] | Short term borrowings and debt [Member] |  |
Disclosure of short term borrowings [Line Items] |  |
Borrowings, interest rate | 1.66% | 1.10%
Top of range [member] | Fixed interest rate [member] | Short term borrowings and debt [Member] | US dollar [Member] |  |
Disclosure of short term borrowings [Line Items] |  |
Borrowings, interest rate | 1.95% | 1.50%
Top of range [member] | Floating interest rate [member] | Short term borrowings and debt [Member] | US dollar [Member] |  |
Disclosure of short term borrowings [Line Items] |  |
Borrowings, interest rate | 2.08% | 1.48%
Top of range [member] | Floating interest rate [member] | Short term borrowings and debt [Member] | Mexican peso [Member] |  |
Disclosure of short term borrowings [Line Items] |  |
Borrowings, interest rate | 7.89% |

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