Income Taxes - Summary of Effective Income Tax Rate on Pretax Earnings (Detail) number in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax benefit (expense) computed at U.S. federal statutory rate	(3360600.00%)	(4100.00%)	(5553300.00%)
Decrease (increase) resulting from:
Statutory depletion	1059500.00%	891800.00%	1554800.00%
Prior year tax return reconciliation	178600.00%	39300.00%	101800.00%
State income taxes, net of federal benefit	(233200.00%)	137000.00%	(341600.00%)
Domestic production deduction	232700.00%	0.00%	391100.00%
Other, net	46900.00%	111100.00%	130900.00%
Income tax benefit (expense)	(2076100.00%)	1175100.00%	(3716300.00%)

Change in percentage of depletion.

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319

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-Publisher FASB
-Name Accounting Standards Codification
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319

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Percentage 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 deduction for qualified production activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

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Percentage 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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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