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Earnings Per Share - Additional Information (Detail)	3 Months Ended	12 Months Ended
Earnings Per Share - Additional Information (Detail)	Mar. 31, 2015	Dec. 31, 2014
Earnings Per Share [Line Items]
Diluted earnings per share excludes antidilutive effect	1,100,000	0
Performance Based Restricted Stock [Member]
Earnings Per Share [Line Items]
Diluted earnings per share excludes antidilutive effect	500,000

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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