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		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020		Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	[1]	$ 3,239,962	$ 2,936,627	$ 3,122,381	[2]	$ 2,967,940
Other comprehensive income (loss) before      reclassifications		3,782	1,913	22,093		18,192
Less: net gain (loss) reclassified from AOCI		6,493	3,512	11,149		4,478
Tax effect		(1,366)	(756)	(1,058)		(1,546)
Net current-period other comprehensive income (loss)		(4,077)	(2,355)	9,886		12,168
Ending Balance		3,236,679	2,960,954	3,236,679		2,960,954
Unrealized Gains (Losses) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance		31,588	19,060	16,614		7,201
Other comprehensive income (loss) before      reclassifications		(2,132)	(1,367)	17,498		11,458
Less: net gain (loss) reclassified from AOCI		6,493	3,512	11,149		4,478
Tax effect		0	0	0		0
Net current-period other comprehensive income (loss)		(8,625)	(4,879)	6,349		6,980
Ending Balance		22,963	14,181	22,963		14,181
Unrealized Gains (Losses) on Available for-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance		2,539	748	3,565		(1,917)
Other comprehensive income (loss) before      reclassifications		5,914	3,279	4,580		6,734
Less: net gain (loss) reclassified from AOCI		0	0			0
Tax effect		(1,366)	(756)	(1,058)		(1,546)
Net current-period other comprehensive income (loss)		4,548	2,523	3,522		5,188
Ending Balance		7,087	3,271	7,087		3,271
Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance		0	(14)	(15)		(13)
Other comprehensive income (loss) before      reclassifications		0	1	15		0
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	1	15		0
Ending Balance		0	(13)	0		(13)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	[1]	34,127	19,794	20,164		5,271
Ending Balance		$ 30,050	$ 17,439	$ 30,050		$ 17,439

[1] The beginning balances for the six-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.