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Income Taxes - Reconciliation Between Statutory Federal Income Tax Rate and Effective Income Tax (Detail) | 12 Months Ended
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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%)

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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