Debt - Long-Term Debt Maturities (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
2020	$ 29,894
2021	583,417
2022	943,005
2023	1,003,336
2024	1,029,058
Thereafter	12,126,508
Subtotal	15,715,218
Unamortized net premiums	29,083
Unamortized debt issuance costs	(67,709)
Total	15,676,592	$ 11,905,877
Credit Facilities [Member]
Debt Instrument [Line Items]
2020	0
2021	52,522
2022	0
2023	0
2024	0
Thereafter	0
Subtotal	52,522
Unamortized net premiums	0
Unamortized debt issuance costs	0
Total	52,522	184,255
Senior Notes [Member]
Debt Instrument [Line Items]
2020	0
2021	0
2022	931,260
2023	850,000
2024	766,920
Thereafter	10,528,222
Subtotal	13,076,402
Unamortized net premiums	26,219
Unamortized debt issuance costs	(57,540)
Total	13,045,081	9,660,570
Term Loans And Other Debt [Member]
Debt Instrument [Line Items]
2020	10,785
2021	500,000
2022	0
2023	119,617
2024	0
Thereafter	1,308,454
Subtotal	1,938,856
Unamortized net premiums	0
Unamortized debt issuance costs	(7,901)
Total	1,930,955	1,441,882
Secured Mortgages [Member]
Debt Instrument [Line Items]
2020	19,109
2021	30,895
2022	11,745
2023	33,719
2024	262,138
Thereafter	289,832
Subtotal	647,438
Unamortized net premiums	2,864
Unamortized debt issuance costs	(2,268)
Total	$ 648,034	$ 619,170

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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