Debt - Long-Term Debt Maturities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
2020	$ 535,753
2021	1,066,281
2022	798,387
2023	1,015,195
2024	1,048,755
Thereafter	7,530,346
Subtotal	11,994,717
Premiums (discounts), net	(46,070)
Debt issuance costs, net	(42,770)
Total	11,905,877	$ 11,089,815
Credit Facilities [Member]
Debt Instrument [Line Items]
2020	0
2021	184,255
2022	0
2023	0
2024	0
Thereafter	0
Subtotal	184,255
Premiums (discounts), net	0
Debt issuance costs, net	0
Total	184,255	50,500
Senior Notes [Member]
Debt Instrument [Line Items]
2020	449,360
2021	786,380
2022	786,380
2023	850,000
2024	786,380
Thereafter	6,080,150
Subtotal	9,738,650
Premiums (discounts), net	(46,568)
Debt issuance costs, net	(31,512)
Total	9,660,570	8,304,147
Term Loans And Other Debt [Member]
Debt Instrument [Line Items]
2020	10,945
2021	0
2022	0
2023	131,214
2024	0
Thereafter	1,308,207
Subtotal	1,450,366
Premiums (discounts), net	0
Debt issuance costs, net	(8,484)
Total	1,441,882	1,921,428
Secured Mortgages [Member]
Debt Instrument [Line Items]
2020	75,448
2021	95,646
2022	12,007
2023	33,981
2024	262,375
Thereafter	141,989
Subtotal	621,446
Premiums (discounts), net	498
Debt issuance costs, net	(2,774)
Total	$ 619,170	$ 813,740

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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