Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Balances of AOCI Including Current Period Other Comprehensive Income (Loss) and Reclassifications Out of AOCI (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	[1]	$ 3,236,679	$ 2,960,954	$ 3,122,381	[2]	$ 2,967,940
Other comprehensive income (loss) before      reclassifications		(18,295)	24,492	3,798		42,684
Less: net gain (loss) reclassified from AOCI		1,878	4,808	13,027		9,286
Tax effect		508	(120)	(550)		(1,666)
Net current-period other comprehensive income (loss)		(19,665)	19,564	(9,779)		31,732
Ending balance		4,053,893	3,074,405	4,053,893		3,074,405
Unrealized Gains (Losses) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		22,963	14,181	16,614		7,201
Other comprehensive income (loss) before      reclassifications		(16,094)	23,973	1,404		35,431
Less: net gain (loss) reclassified from AOCI		1,878	4,808	13,027		9,286
Tax effect		0	0	0		0
Net current-period other comprehensive income (loss)		(17,972)	19,165	(11,623)		26,145
Ending balance		4,991	33,346	4,991		33,346
Unrealized Gains (Losses) on Available for-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		7,087	3,271	3,565		(1,917)
Other comprehensive income (loss) before      reclassifications		(2,201)	522	2,379		7,256
Less: net gain (loss) reclassified from AOCI		0	0			0
Tax effect		508	(120)	(550)		(1,666)
Net current-period other comprehensive income (loss)		(1,693)	402	1,829		5,590
Ending balance		5,394	3,673	5,394		3,673
Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		0	(13)	(15)		(13)
Other comprehensive income (loss) before      reclassifications		0	(3)	15		(3)
Less: net gain (loss) reclassified from AOCI		0	0	0		0
Tax effect		0	0	0		0
Net current-period other comprehensive income (loss)		0	(3)	15		(3)
Ending balance		0	(16)	0		(16)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	[1]	30,050	17,439	20,164		5,271
Ending balance		$ 10,385	$ 37,003	$ 10,385		$ 37,003

[1] The beginning balances for the nine-month periods were derived from the audited Consolidated Financial Statements included in Company’s Annual Report on Form 10-K for the years ended December 31, 2019 and 2018, respectively, filed with the SEC on February 27, 2020.

[2] December 31, 2019 balances were derived from the audited Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019, filed with the SEC on February 27, 2020.