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Loss Per Share - Additional Information (Detail)	3 Months Ended	12 Months Ended
Loss Per Share - Additional Information (Detail)	Mar. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Options to purchase shares, contingently issuable shares, and common stock warrants excluded from diluted net income per share computation	8,500,000	9,400,000
Common stock outstanding	116,712,055us-gaap_CommonStockSharesOutstanding	115,637,804us-gaap_CommonStockSharesOutstanding

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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