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Earnings Per Share Reconciliation - Schedule of Earnings Per Common Share Reconciliation (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 common share:
Net earnings	$ 24,295	$ 24,239	$ 78,440	$ 70,320
Less: Net earnings allocated to restricted stock	134	74	409	218
Net earnings allocated to common shareholders	24,161	24,165	78,031	70,102
Weighted average shares outstanding	104,875	104,766	105,218	104,657
Earnings per common share	$ 0.23	$ 0.23	$ 0.74	$ 0.67
Diluted earnings per common share:
Net income allocated to common shareholders	$ 24,161	$ 24,165	$ 78,031	$ 70,102
Weighted average shares outstanding	104,875	104,766	105,218	104,657
Incremental shares from assumed exercise of outstanding options	531	451	542	330
Diluted weighted average shares outstanding	105,406	105,217	105,760	104,987
Diluted earnings per common share	$ 0.23	$ 0.23	$ 0.74	$ 0.67

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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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