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Nonvested Share Awards (Detail) (Unvested Restricted Awards, Certain key Employees, USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Unvested Restricted Awards \| Certain key Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares	345,038	596,113
Value of awards issued	$ 13.0	$ 18.2

Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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