Derivatives and Hedging Activities - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosures
Reclass amount as a decrease to interest expense	$ 188,682	$ (177,244)	$ (344,733)	$ (201,460)	$ (293,485)	$ 87,672	$ 67,169	$ 133,367	$ (534,755)	$ (5,277)	$ 18,155
Accumulated other comprehensive income	288,963				220,813				288,963	220,813
Notional amount	14,488,077				14,609,961				14,488,077	14,609,961
Interest Rate Swaps
Derivative Instruments and Hedging Activities Disclosures
Reclass amount as a decrease to interest expense									23,700	25,800	$ 25,500
Loss to be reclassified during the next 12 months	23,800								23,800
Notional amount	14,000,000				12,370,000				14,000,000	12,370,000
Currency Forward Contracts
Derivative Instruments and Hedging Activities Disclosures
Notional amount	23,111				23,149				23,111	23,149
Euro | Currency Forward Contracts
Derivative Instruments and Hedging Activities Disclosures
Notional amount	23,100				23,100				23,100	23,100
Derivatives and hedging | Interest Rate Swaps
Derivative Instruments and Hedging Activities Disclosures
Accumulated other comprehensive income	$ 75,900				$ 99,600				$ 75,900	$ 99,600
Minimum | Interest Rate Swaps
Derivative Instruments and Hedging Activities Disclosures
Repurchase obligation maturity									1 month
Maximum | Interest Rate Swaps
Derivative Instruments and Hedging Activities Disclosures
Repurchase obligation maturity									6 months