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Securities Outstanding that could Potentially Dilute Per Share Data (Detail) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities outstanding that could potentially dilute per share data	23,398	19,726
Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities outstanding that could potentially dilute per share data	14,494	10,700
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Securities outstanding that could potentially dilute per share data	8,904	9,026

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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