Income Taxes - Reconciliation of Effective Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal tax based on statutory rate	$ 104,914	$ 84,531	$ 102,508
Effect of tax-exempt income	(6,314)	(5,801)	(9,435)
Interest and other nondeductible expenses	10,429	6,464	9,605
State taxes, net of federal benefit	18,073	12,459	6,970
Tax credits	(4,363)	(5,179)	(5,618)
Other	(7,301)	(60,196)	46,436
Total income tax expense	$ 115,438	$ 32,278	$ 150,466
Effective tax rate	23.10%	8.00%	51.40%
Discrete tax items		$ 6,600
TCJA one-time tax expense	$ 2,300		$ 51,000
Equity based compensation	$ 900		3,000
Reversal of prior year deferred tax asset impairment			1,000
Deferred REIT distribution			$ 600