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Summary of Significant Accounting Policies - Intangible and Leased Assets - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018
Bottom of range [member] | Intangible under finance lease [member]
Disclosure of detailed information about intangible assets [line Items]
Estimated lives	3 years
Bottom of range [member] | Client relationships [member] | Not internally generated [member]
Disclosure of detailed information about intangible assets [line Items]
Estimated lives	10 years
Bottom of range [member] | Contract backlog and finite trademarks [member] | Not internally generated [member]
Disclosure of detailed information about intangible assets [line Items]
Estimated lives	1 year
Top of range [member] | Intangible under finance lease [member]
Disclosure of detailed information about intangible assets [line Items]
Estimated lives	7 years
Top of range [member] | Client relationships [member] | Not internally generated [member]
Disclosure of detailed information about intangible assets [line Items]
Estimated lives	15 years
Top of range [member] | Contract backlog and finite trademarks [member] | Not internally generated [member]
Disclosure of detailed information about intangible assets [line Items]
Estimated lives	3 years

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 useful lives or amortisation rates used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2018-01-01
-Paragraph 118
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_a&doctype=Standard
-URIDate 2018-03-16

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