Income Taxes - Reconciliation Between Statutory Federal Income Tax Rate and Effective Income Tax (Detail)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Federal statutory tax rate	21.00%	35.00%	35.00%
Federal rate change	0.00%	(406.70%)	0.00%
State	(0.30%)	(0.70%)	3.00%
State rate and law change	0.90%	(1.30%)	1.00%
Non-deductible executive compensation	0.00%	0.70%	(0.20%)
Valuation allowances	(0.40%)	36.80%	(2.50%)
Equity compensation	(0.10%)	30.20%	(0.70%)
Goodwill impairment	(19.40%)	0.00%	0.00%
Other	0.00%	0.30%	0.00%
Consolidated effective tax rate	1.70%	(305.70%)	35.00%
MRD
Income Taxes [Line Items]
Non-deductible MRD transaction costs	0.00%	0.00%	(0.60%)

Effective income tax rate reconciliation nondeductible equity compensation in excess of additional paid in capital.

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Effective income tax rate reconciliation nondeductible transaction costs.

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Effective income tax rate reconciliation state rate and law change.

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Income taxes.

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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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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 changes in the valuation allowance for deferred tax assets.

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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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