Components of Calculation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net loss	$ (11,899)		$ (26,340)
Weighted-average shares, basic	45,945		45,687
Effect of dilutive securities		[1]		[1]
Weighted-average shares, diluted	45,945		45,687

[1] For the three months ended March 31, 2012 and 2011, an amount less than 0.1 million and 0.1 million potentially dilutive securities, including the Convertible Notes, stock options, restricted stock and restricted stock units had the effect of being anti-dilutive and were excluded from the calculation of diluted earnings per common share.