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Related-Party Disclosures - Summary of Joint Operations (Detail)	12 Months Ended
	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

X

- 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

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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

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