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Income Taxes - Loss from Continuing Operations Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Benefit for income taxes at federal statutory rate									$ (14,802)	$ (24,868)	$ (45,531)
State current and deferred income tax benefit									(4,089)	(2,699)	(4,452)
Tax reform										(22,988)
Energy credit											(888)
Other									1,915	2,145	(2,940)
Provision (benefit) for income taxes	$ (764)	$ 2,426	$ (4,324)	$ 922	$ 30,018	$ 6,698	$ 2,761	$ 1,282	1,740	(40,759)	(41,956)
Federal [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance									14,604
State [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance									$ 4,112	$ 7,651	$ 11,855

X

- Definition

A credit or adjustment for government or taxing authority authorized decrease in taxes owed as a result of meeting certain tax policy conditions.

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