Equity and Earnings (Loss) per Share (Detail) - The Computations of Basic and Diluted Earnings (Loss) Per Share (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Continuing Operations:
Net income (loss) from continuing operations attributable to shareholders									$ 23,675	$ (5,807)
Less: Amounts allocated to participating securities (non-vested shares and units)									832	0
Net income (loss) from continuing operations attributable to common shareholders									22,843	(5,807)
Discontinued Operations:
Discontinued operations, net of tax	0	0	0	0	(528)	0	0	1,406	0	878
Less: Amounts allocated to participating securities (nonvested shares and units)									0	0
Discontinued operations attributable to common shareholders									0	878
Net income (loss)									$ 22,843	$ (4,929)
Share information:
Basic weighted average common shares (in Shares)									17,305,866	17,069,455
Additional weighted average shares attributable to: Stock options (in Shares)									0	0
Diluted weighted average common shares (in Shares)									17,305,866	17,069,455
Basic earnings (loss) per share
Income (loss) from continuing operations (in dollars per share)	$ 0.42	$ 0.34	$ 0.28	$ 0.26	$ 0.01	$ (0.37)	$ 0.02	$ 0.00	$ 1.32	$ (0.34)
Income from discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ (0.03)	$ 0.00	$ 0.00	$ 0.08	$ 0.00	$ 0.05
Income (loss) from continuing operations (in dollars per share)									$ 1.32	$ (0.29)
Diluted earnings (loss) per share
Income (loss) from continuing operations (in dollars per share)									$ 1.32	$ (0.34)
Income from discontinued operations (In dollars per share)									$ 0.00	$ 0.05
Net income (loss) (in dollars per share)									$ 1.32	$ (0.29)