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Earnings per Share - Additional Information (Detail)	3 Months Ended
Earnings per Share - Additional Information (Detail)	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Number of anti-dilutive instruments excluded from computation of weighted-average shares for diluted earnings per share	6,085	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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