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Stock Incentive Plans - Summary of Information Concerning Restricted Stock Awards (Detail) - $ / shares
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Shares, Unvested awards outstanding at beginning of period 1,548,444 1,354,093
Shares, Net adjustment due to performance   (46,956)
Shares, Vested (363,799) (458,450)
Shares, Forfeited (6,368) (2,357)
Shares, Dividend reinvestment 10,870 7,656
Shares, Unvested shares outstanding at end of year 1,189,147 853,986
Weighted Average Grant Price per Share, Unvested awards outstanding at beginning of period $ 12.85 $ 11.86
Weighted Average Grant Price per Share, Net adjustment due to performance   10.25
Weighted Average Grant Price per Share, Vested 12.07 10.60
Weighted Average Grant Price per Share, Forfeited 12.79 17.93
Weighted Average Grant Price per Share, Dividend reinvestment 11.50 14.24
Weighted Average Grant Price per Share, Unvested Shares outstanding at end of year $ 13.08 $ 12.63