INCOME TAXES- Reconciliations of Income tax expenses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Computed income tax at statutory rate	$ (50,801)	$ (10,810)	$ (35,738)
Federal and state taxes	0	(190)	(117)
Adjustment in deferred tax due to change in tax rate	0	0	(346)
Benefit of net exempt income	14,995	9,780	15,202
Deferred tax valuation allowance	5,976	2,881	318,380
(Recognition)/reversal of Unrecognized Tax Benefits	0	0	1,763
National Receipt Tax Net	0	0	628
Non-tax deductible expenses	(212)	365	(193)
Other-net	569	1,117	1,070
Total income tax provision	$ (37,030)	$ (6,419)	$ 300,649
Statutory rate	(39.00%)	(39.00%)	(39.00%)
Federal and state taxes %	0.00%	(0.70%)	(0.10%)
Adjustment in deferred tax due to change in tax rate %	0.00%	0.00%	(0.40%)
Benefit of net exempt income %	11.50%	35.30%	17.00%
Deferred tax valuation allowance %	4.60%	10.40%	347.00%
(Recognition)/reversal of Unrecognized Tax Benefits %	0.00%	0.00%	2.00%
Percentage Of National Gross Receipt Tax Net	0.00%	0.00%	0.70%
Income Tax Reconciliation Deductions Other	$ (727)	$ (3,019)	$ 0
Effective Income Tax Rate Reconciliation Deductions Other	(0.60%)	(10.90%)	0.00%
Non-tax deductible expenses %	(0.20%)	1.30%	(0.20%)
Other-net %	0.30%	4.00%	1.20%
Total income tax provision %	(28.60%)	(23.20%)	(328.20%)
Income Tax Rate Reconciliation NOL Carryforwards	$ (6,396)	$ (7,717)	$ 0
Effective Income Tax Rate Reconciliations NOL Carryforwards	(4.90%)	(27.80%)	0.00%
Income Tax Rate Reconciliation Prior Periods Income Tax Returns	$ (434)	$ 1,174	$ 0
Effecetive Income Tax Rate Reconciliations Prior Periods Income Tax Returns	(0.30%)	4.20%	0.00%