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Significant Accounting Policies - Summary of Statutory Tax Rates (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation of Effective Tax Rate [Line Items] |  |  |
Applicable tax rate | 30.00% | 30.00% | 30.00%
Mexico [member] |  |  |
Reconciliation of Effective Tax Rate [Line Items] |  |  |
Applicable tax rate | 30.00% | 30.00% | 30.00%
United States [member] |  |  |
Reconciliation of Effective Tax Rate [Line Items] |  |  |
Applicable tax rate | 35.00% | 35.00% | 35.00%
United Kingdom [member] |  |  |
Reconciliation of Effective Tax Rate [Line Items] |  |  |
Applicable tax rate | 19.30% | 20.00% | 20.30%
France [member] |  |  |
Reconciliation of Effective Tax Rate [Line Items] |  |  |
Applicable tax rate | 34.40% | 34.40% | 38.00%
Germany [member] |  |  |
Reconciliation of Effective Tax Rate [Line Items] |  |  |
Applicable tax rate | 28.20% | 28.20% | 29.80%
Spain [member] |  |  |
Reconciliation of Effective Tax Rate [Line Items] |  |  |
Applicable tax rate | 25.00% | 25.00% | 28.00%
Philippines [member] |  |  |
Reconciliation of Effective Tax Rate [Line Items] |  |  |
Applicable tax rate | 30.00% | 30.00% | 30.00%
Colombia [member] |  |  |
Reconciliation of Effective Tax Rate [Line Items] |  |  |
Applicable tax rate | 40.00% | 40.00% | 39.00%
Egypt [member] |  |  |
Reconciliation of Effective Tax Rate [Line Items] |  |  |
Applicable tax rate | 22.50% | 22.50% | 22.50%
Switzerland [member] |  |  |
Reconciliation of Effective Tax Rate [Line Items] |  |  |
Applicable tax rate | 9.60% | 9.60% | 9.60%
Bottom of range [member] | Other [member] |  |  |
Reconciliation of Effective Tax Rate [Line Items] |  |  |
Applicable tax rate | 7.80% | 7.80% | 7.80%
Top of range [member] | Other [member] |  |  |
Reconciliation of Effective Tax Rate [Line Items] |  |  |
Applicable tax rate | 39.00% | 39.00% | 39.00%

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2017-03-09 + Details
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