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Incentive Compensation Plan - Unvested Target Award (Detail) - shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding, beginning of the year, Shares 265,000 271,000 253,000
Granted, Shares 135,370 94,626 58,000
Vested, Shares (168,536) (98,487) (35,000)
Forfeited, Shares 0 (2,139) (5,000)
Outstanding, end of the year, Shares 231,834 265,000 271,000
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 the year, Shares 284,000 250,777 151,333
Granted, Shares 185,000 126,389 138,611
Vested, Shares (34,200) (12,626) 0
Forfeited, Shares (114,095) (80,540) (39,167)
Outstanding, end of the year, Shares 320,705 284,000 250,777