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Share-based Payments Arrangement - CHIEF's Employee Stock Options Outstanding (Detail) - CHIEF Telecom Inc. (CHIEF) [Member]	12 Months Ended
	Dec. 31, 2021 $ / shares	Dec. 31, 2020 $ / shares	Sep. 30, 2021 $ / shares	Nov. 13, 2020 $ / shares	Jul. 31, 2020 $ / shares	Dec. 31, 2019 $ / shares	Jun. 30, 2019 $ / shares	Dec. 31, 2018 $ / shares	Oct. 31, 2018 $ / shares	Dec. 19, 2017 $ / shares
Grant Date 2017.12.19 [Member]
Disclosure Of Range Of Exercise Prices Of Outstanding Share Options [Line Items]
Range of Exercise Price	$ 128.70	$ 132.70	$ 128.70		$ 132.70		$ 135.60			$ 140.60
Number of Options Outstanding	213.25	427.50				897.00		925.00
Weighted-average Remaining Contractual Life (Years)	11 months 15 days	1 year 11 months 15 days
Weighted-average Exercise Price	$ 128.70	$ 132.70				$ 135.60		$ 140.60
Options Exercisable Number of Options	213.25	213.75				448.50
Option Exercisable Weighted-average Exercise Price	$ 128.70	$ 132.70				$ 135.60
Granted Date 2018.10.31 [Member]
Disclosure Of Range Of Exercise Prices Of Outstanding Share Options [Line Items]
Range of Exercise Price	$ 134.50	$ 138.70	134.50		$ 138.70		$ 141.70		$ 147.00
Number of Options Outstanding	10.50	21.00				46.00		50.00
Weighted-average Remaining Contractual Life (Years)	1 year 9 months 29 days	2 years 9 months 29 days
Weighted-average Exercise Price	$ 134.50	$ 138.70				$ 141.70		$ 147.00
Options Exercisable Number of Options	0	0				0
Option Exercisable Weighted-average Exercise Price	$ 0	$ 0				$ 0
Granted Date 2020.11.13 [Member]
Disclosure Of Range Of Exercise Prices Of Outstanding Share Options [Line Items]
Range of Exercise Price	$ 199.70	$ 206.00	$ 199.70	$ 206.00
Number of Options Outstanding	194.00	200.00				0
Weighted-average Remaining Contractual Life (Years)	3 years 10 months 13 days	4 years 10 months 13 days
Weighted-average Exercise Price	$ 199.70	$ 206.00				$ 0
Options Exercisable Number of Options	0	0
Option Exercisable Weighted-average Exercise Price	$ 0	$ 0

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