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Common Equity and Earnings per Share - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Class of Stock
Payments of dividends, common stock			$ 0		$ 0
Preferred stock, shares issued	0		0		0
Preferred stock, shares outstanding	0		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	863,000	979,000	925,000	880,000
Class B Convertible
Class of Stock
Common stock, votes per share			10

X

- 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.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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