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Common Equity and Earnings per Share - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Class of Stock |  |  |
Payments of dividends, common stock | $ 0 |  | $ 0
Preferred stock, shares issued | 0 |  | 0
Preferred stock, shares outstanding | 0 |  | 0
Class A |  |  |
Class of Stock |  |  |
Common stock, votes per share | one |  |
Class A | 2013 Plan |  |  |
Class of Stock |  |  |
Shares issuable under stock options excluded from calculation of diluted earnings per share | 1,471,000 | 721,000 |
Class B Convertible |  |  |
Class of Stock |  |  |
Common stock, votes per share | 10 |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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