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Securities Outstanding that could Potentially Dilute Per Share Data (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities outstanding that could potentially dilute per share data	23,286	20,530	19,427
Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities outstanding that could potentially dilute per share data	14,712	11,626	10,308
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities outstanding that could potentially dilute per share data	8,574	8,904	9,119

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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