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Basic and Diluted Earnings per Share - Additional Information (Detail) (Class A, 2013 Plan)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Class A \| 2013 Plan
Earnings Per Share [Line Items]
Shares issuable under stock options excluded from calculation of diluted earnings per share	735,000	600,000	0

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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