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Income Taxes - Reconciliation of Statutory and Effective Tax Rate After Adjustments for Non-Includable Partnership Income Arising from Non-Controlling Interest (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal statutory rate	(21.00%)	(35.00%)
State income taxes - net of federal benefit	(4.74%)	(3.90%)
Permanent differences	16.52%	(10.94%)
Return to provision adjustments	(4.29%)	5.18%
Change in valuation allowance	14.32%	(417.08%)
Current state income tax	0.36%	0.56%
Change in enacted rate	1.52%	462.23%
Other, net	(2.45%)	(0.15%)
Effective tax rate	0.24%	0.91%

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Effective income tax rate reconciliation current state income taxes.

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Effective income tax rate reconciliation permanent differences.

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

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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