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Related-Party Disclosures - Summary of Joint Operations (Detail) | 12 Months Ended
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Dec. 31, 2017
Balfour Beatty MWH Joint Venture (The Advance JV) [member] | United Kingdom [member] |
Disclosure of joint operations [line items] |
Ownership Interests | 50.00%
Jurisdiction | United Kingdom
Costain MWH Delivery Partner [member] | United Kingdom [member] |
Disclosure of joint operations [line items] |
Ownership Interests | 50.00%
Jurisdiction | United Kingdom
Efficient Service Delivery [member] | United Kingdom [member] |
Disclosure of joint operations [line items] |
Ownership Interests | 33.00%
Jurisdiction | United Kingdom
MBV Energy Recovery [member] | United Kingdom [member] |
Disclosure of joint operations [line items] |
Ownership Interests | 50.00%
Jurisdiction | United Kingdom
MWH Constructors Israel Inc Shikun And Binui Solei Boneh Infrastructure Ltd Joint Venture [member] | Israel [member] |
Disclosure of joint operations [line items] |
Ownership Interests | 50.00%
Jurisdiction | Israel
MWHT Costain Joint Venture [member] | United Kingdom [member] |
Disclosure of joint operations [line items] |
Ownership Interests | 50.00%
Jurisdiction | United Kingdom
Skanska Mwh Balfour Beatty Joint Venture [member] | United Kingdom [member] |
Disclosure of joint operations [line items] |
Ownership Interests | 33.00%
Jurisdiction | United Kingdom

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The principal place of business of a joint operation. [Refer: Joint operations [member]; Principal place of business] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 21 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_21_a_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The proportion of ownership interest in a joint operation attributable to the entity. [Refer: Joint operations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_21_a_iv&doctype=Standard -URIDate 2017-03-09 + Details
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