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Schedule of Information Related to Options Exercised (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of stock options exercised	$ 6,334	$ 2,269	$ 3,725
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received from stock options exercised	$ 19,209	$ 2,336	$ 6,076

The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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