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Stock-Based Compensation (Detail) - (Table 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Proceeds from stock options exercised	$ 2,897	$ 511	$ 19,703	$ 1,032
Intrinsic value of stock options exercised	$ 1,848	$ 549	$ 29,294	$ 1,135

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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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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