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INCOME TAXES - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ (14,900,000)	$ 18,300,000	$ (15,800,000)	$ 31,500,000
Effective tax rate	570.30%	40.80%	(115.90%)	40.60%
Tax credit	$ 15,700,000		$ 24,500,000
Valuation allowance	0		0		$ 0
Net deferred tax asset	9,500,000		9,500,000		10,000,000
Valuation Allowance [Line Items]
Unrecognized tax benefits	0		0		0
Accrued interest or penalties	$ 0		0		$ 0
Excess benefit from stock based compensation			1,100,000
Unrealized gain on securities available-for-sale
Valuation Allowance [Line Items]
Increase (decrease) in deferred tax asset			12,800,000
Reversal of bonus accrual
Valuation Allowance [Line Items]
Increase (decrease) in deferred tax asset			(7,200,000)
Sale of discontinued operations
Valuation Allowance [Line Items]
Increase (decrease) in deferred tax asset			$ 19,500,000

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