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Share-Based Payments - Summary of Grants, Exchanges and Forfeitures of Restricted Stock and RSUs (Detail) - LTIP [Member]
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
shares
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 (in shares) 340,064
Outstanding, end of period (in shares) 340,064
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 (in shares) 1,242,810
Outstanding, end of period (in shares) 975,106
January 2016 [Member] | RSUs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Cancelled upon delivery (in shares) (318,160)
Forfeiture (in shares) (1,667)
February 2016 [Member] | RSUs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Grant (in shares) 47,028
Estimated Fair Value on Grant Date | $ $ 729
March 2016 [Member] | RSUs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Grant (in shares) 5,095
Estimated Fair Value on Grant Date | $ $ 81