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Computation of Basic and Diluted Earnings (Loss) Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income	$ 9,761	$ 6,948	$ 51,792	$ 27,977
Weighted average shares outstanding - basic	25,137,531	25,082,237	25,126,684	25,065,725
Net income per share	$ 0.39	$ 0.28	$ 2.06	$ 1.12
Weighted average shares outstanding - diluted	25,334,716	25,189,072	25,323,187	25,150,920
Net income per share	$ 0.39	$ 0.28	$ 2.05	$ 1.11

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

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

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