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Stock-Based Compensation - Information about Options Exercised (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award Options Activity [Abstract]
Options exercised	80,000		50,000	80,000	50,000
Total intrinsic value of exercised options	$ 3,188			$ 3,188	$ 1,970
Fair value of vested stock options		$ 17			17
Tax benefits realized	$ 1,192			$ 1,192	$ 603

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- Definition

Share based compensation arrangement by share based payment award options activity.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Number of share options (or share units) exercised during the current period.

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