Acquisitions - Preliminary Purchase Price Allocation (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Apr. 18, 2018	Apr. 02, 2018
Allocation of purchase price consideration
Goodwill	$ 4,768,880	$ 4,836,388
Metronode [Member]
Allocation of purchase price consideration
Cash and cash equivalents			$ 3,206
Accounts receivable			8,318
Other current assets			9,421
Property, plant, and equipment			297,092
Intangible assets			128,229
Goodwill			410,188
Other assets			44,373
Total assets acquired			900,827
Accounts payable and accrued liabilities			(17,104)
Other current liabilities			(2,038)
Deferred tax liabilities			(31,281)
Other liabilities			(45,851)
Net assets acquired			804,553
Indemnification assets			$ 44,400
Infomart Dallas [Member]
Allocation of purchase price consideration
Cash and cash equivalents				$ 17,432
Accounts receivable				637
Other current assets				395
Property, plant, and equipment				362,023
Intangible assets				65,847
Goodwill				197,378
Other assets				0
Total assets acquired				643,712
Accounts payable and accrued liabilities				(5,056)
Other current liabilities				(2,141)
Deferred tax liabilities				0
Other liabilities				(4,723)
Net assets acquired				$ 631,792