Earnings Per Share - Reconciliation of Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings per common share:
Net earnings	$ 24,239	$ 9,257	$ 70,320	$ 55,144
Less: Net earnings allocated to restricted stock	74	30	218	179
Net earnings allocated to common shareholders (numerator)	24,165	9,227	70,102	54,965
Weighted average shares outstanding (denominator)	104,766	104,456	104,657	104,380
Earnings per common share	$ 0.23	$ 0.09	$ 0.67	$ 0.53
Diluted earnings per common share:
Net income allocated to common shareholders (numerator)	$ 24,165	$ 9,227	$ 70,102	$ 54,965
Weighted average shares outstanding	104,766	104,456	104,657	104,380
Incremental shares from assumed exercise of outstanding options	451	320	330	259
Diluted weighted average shares outstanding (denominator)	105,217	104,776	104,987	104,639
Diluted earnings per common share	$ 0.23	$ 0.09	$ 0.67	$ 0.53

Net earnings allocated to restricted stock.

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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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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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