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INCOME TAX - Reconciliation of U.S. Statutory Income Tax Rate to Effective Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Federal income tax expense at statutory rate	$ 36,759	$ 33,566	$ 32,733
State income tax, net of federal income tax benefit	6,677	6,999	7,953
Net operating loss carryback	(3,445)	0	0
Excess tax benefits of share-based compensation	(60,190)	(29,819)	(32,487)
Adjustments from the 2017 Tax Cuts and Jobs Act	0	0	(1,750)
Tax credits	(3,867)	(3,446)	(3,715)
Non-deductible business expenses	4,199	6,011	5,655
Other, net	89	0	19
Income tax expense benefit	$ (19,778)	$ 13,311	$ 8,408

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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