Earnings Per Share (Calculation of Basic and Diluted Earnings Per Share) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Net income (loss) available to common shareholders	$ (22,178)	$ (31,375)	$ (50,977)	$ (61,520)
Weighted average common shares outstanding used to compute basic EPS	36,003	35,670	35,912	35,490
Dilutive effect of stock based awards	0	0	0	0
Weighted average common shares outstanding used to compute diluted EPS	36,003	35,670	35,912	35,490
Basic EPS (USD per share)	$ (0.62)	$ (0.88)	$ (1.42)	$ (1.73)
Diluted EPS (USD per share)	$ (0.62)	$ (0.88)	$ (1.42)	$ (1.73)