Leases - Narrative (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2019 HKD ($)	Jun. 30, 2019 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items]
Operating Lease, Liability		$ 1,465,260,000
Operating lease right-of-use assets		1,468,378,000	$ 1,468,762,000	$ 0
Lease liability		260,300,000
Hong Kong 4 Data Center [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Liability	$ 317.3	40,600,000
Operating lease right-of-use assets	$ 317.3	40,600,000
Property, plant and equipment [Member]
Lessee, Lease, Description [Line Items]
Right-of-use asset, finance lease		968,200,000
Finance lease, amortization		$ 449,400,000
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lease not yet commenced, remaining lease term	5 years
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lease not yet commenced, remaining lease term	29 years