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Share-Based Payments Summary of Grants, Exchanges and Forfeitures of Restricted Stock and RSUs (Detail) (LTIP [Member])
3 Months Ended
Mar. 31, 2014
Restricted Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Outstanding, beginning of period 208,416
Canceled upon delivery 0
Outstnading, end of period 208,416
RSUs [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Outstanding, beginning of period 503,750
Canceled upon delivery (288,750)
Outstnading, end of period 215,000