Basis of Presentation and Significant Accounting Policies - Narrative (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2020 USD ($)	Jan. 08, 2020 data_center	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective income tax rate, continuing operations	22.90%	25.60%
Adjustments due to adoption of ASU 2016-13	$ 10,388,258	$ 8,749,229	$ 8,669,294			$ 8,840,382	$ 8,424,788	$ 7,219,279
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustments due to adoption of ASU 2016-13	1,642,621	$ 1,145,580	$ 1,509,317			1,391,425	$ 1,002,053	889,948
COVID-19
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in allowance for credit loss COVID-19	6,300
Payments for one-time bonus and compensation costs COVID-19	$ 8,600
Cumulative adjustment due to adoption of ASU
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustments due to adoption of ASU 2016-13						(900)		(5,973)
Cumulative adjustment due to adoption of ASU | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustments due to adoption of ASU 2016-13					$ 900	$ (900)		$ (5,973)
Axtel
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Data centers purchased | data_center				3