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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Common Equity and Earnings per Share - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Class of Stock
Payments of dividends, common stock	$ 0		$ 0
Preferred stock, shares issued	0		0
Preferred stock, shares outstanding	0		0
2013 Plan
Class of Stock
Shares issuable under stock options excluded from calculation of diluted earnings per share	377,000	207,000
Class A
Class of Stock
Common stock, votes per share	One
Class B Convertible
Class of Stock
Common stock, votes per share	Ten