Acquisitions - Preliminary Purchase Price Allocation (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 01, 2021	Dec. 31, 2020	Oct. 01, 2020	Mar. 02, 2020	Jan. 08, 2020
Allocation of purchase price consideration
Goodwill	$ 5,401,744		$ 5,472,553
GPX India
Allocation of purchase price consideration
Cash and cash equivalents		$ 9,406
Accounts receivable		4,399
Other current assets		8,771
Property, plant and equipment		88,108
Operating lease right-of-use assets		62
Intangible assets		15,472
Goodwill		77,296
Deferred tax and other assets		20
Total assets acquired		203,534
Accounts payable and accrued liabilities		(1,591)
Other current liabilities		(478)
Operating lease liabilities		(62)
Finance lease liabilities		(20,565)
Deferred tax and other liabilities		(10,373)
Net assets acquired		$ 170,465
Bell
Allocation of purchase price consideration
Cash and cash equivalents				$ 0
Accounts receivable				0
Other current assets				696
Property, plant and equipment				538,717
Operating lease right-of-use assets				14,359
Intangible assets				75,857
Goodwill				172,387
Deferred tax and other assets				722
Total assets acquired				802,738
Accounts payable and accrued liabilities				(895)
Other current liabilities				0
Operating lease liabilities				(13,340)
Finance lease liabilities				(80,026)
Deferred tax and other liabilities				(4,495)
Net assets acquired				$ 703,982
Packet Host, Inc.
Allocation of purchase price consideration
Cash and cash equivalents					$ 1,068
Accounts receivable					5,098
Other current assets					299
Property, plant and equipment					27,945
Operating lease right-of-use assets					1,519
Intangible assets					58,500
Goodwill					230,620
Deferred tax and other assets					138
Total assets acquired					325,187
Accounts payable and accrued liabilities					(1,275)
Other current liabilities					(860)
Operating lease liabilities					(1,519)
Finance lease liabilities					(27,945)
Deferred tax and other liabilities					(3,290)
Net assets acquired					$ 290,298
Axtel
Allocation of purchase price consideration
Cash and cash equivalents						$ 0
Accounts receivable						0
Other current assets						14,048
Property, plant and equipment						76,407
Operating lease right-of-use assets						1,646
Intangible assets						22,750
Goodwill						78,902
Deferred tax and other assets						0
Total assets acquired						193,753
Accounts payable and accrued liabilities						(238)
Other current liabilities						0
Operating lease liabilities						(1,586)
Finance lease liabilities						0
Deferred tax and other liabilities						(2,911)
Net assets acquired						$ 189,018