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Earnings (Loss) per Common Share - Additional Information (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options
Earnings Per Share Disclosure [Line Items]
Antidilutive securities excluded from computation of earnings per share	16,000	25,029	27,844
Preferred Stock
Earnings Per Share Disclosure [Line Items]
Antidilutive securities excluded from computation of earnings per share		4,293	15,124
Convertible Senior Notes
Earnings Per Share Disclosure [Line Items]
Antidilutive securities excluded from computation of earnings per share	15,000	15,000	5,100

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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