Earnings Per Common Share (Detail) - Basic and Diluted Earnings Per Common Share (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Earnings Per Share [Abstract]
Net income (loss)	$ 79,306		$ (21,054)		$ 36,563
Preferred dividends	0		0		(8,658)
Preferred Stock, Accretion of Redemption Discount	0	[1]	0	[1]	2,118	[1]
Net (income) loss applicable to participating securities	(1,107)		306		(350)
Net income (loss) applicable to common shares	$ 78,199		$ (20,748)		$ 25,437
Weighted-average common shares outstanding:
Weighted-average common shares outstanding (basic) (in Shares)	73,984		73,665		73,289
Dilutive effect of common stock equivalents (in Shares)	10		1		0
Weighted-average diluted common shares outstanding (in Shares)	73,994		73,666		73,289
Basic earnings (loss) per common share (in Dollars per share)	$ 1.06		$ (0.28)		$ 0.35
Diluted earnings (loss) per common share (in Dollars per share)	$ 1.06		$ (0.28)		$ 0.35
Anti-dilutive shares not included in the computation of diluted earnings per common share (2) (in Shares)	1,462		1,759		3,511

[1] Includes $1.5 million in accelerated amortization related to the redemption of preferred stock during the year ended December 31, 2011.