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Income Taxes - Reconciles Statutory Federal Income Tax Rate to Company' s Effective Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Expected provision at federal statutory tax rate | 35.00% | 35.00% | 35.00%
Increases (decreases) resulting from: |  |  |
State income tax, net of federal tax benefit | 3.20% | 3.20% | 3.40%
Effect of change in tax rate | 2.80% |  | 0.10%
Disallowed meals & entertainment | 0.40% | 0.30% | 0.20%
Disallowed compensation | 0.40% | 0.40% | 1.10%
Excess tax benefit | (3.40%) |  |
Other, net | (1.10%) | 0.10% | (0.60%)
Total income tax expense (benefit) | 37.30% | 39.00% | 39.20%

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- Definition 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 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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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