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Share-Based Payments - Summary of Grants, Exchanges and Forfeitures of Restricted Stock and RSUs (Detail) - LTIP [Member]
$ in Thousands
9 Months Ended
Sep. 30, 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) 357,120
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) 897,550
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
April 2016 [Member] | Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Grant (in shares) 17,056
Estimated Fair Value on Grant Date | $ $ 275
June 2016 [Member] | RSUs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Forfeiture (in shares) (14,972)
July 2016 [Member] | Restricted Stock [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) 0
July 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) (543)
Forfeiture (in shares) (12,792)
Grant (in shares) 1,528
Estimated Fair Value on Grant Date | $ $ 25
August 2016 [Member] | RSUs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Forfeiture (in shares) (15,642)
September 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) (41,281)
Grant (in shares) 6,146
Estimated Fair Value on Grant Date | $ $ 101