Loss Per Common Share - Additional Information (Detail) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Net (loss) income	$ (11,842)	$ (12,075)
Potentially dilutive securities	3.0	2.0
Shares of common stock excluded from computation of diluted earnings per share outstanding	0.9	0.8

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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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