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Equity Compensation Plans - Deferred Stock Units Activity (Detail) - Deferred Stock Units - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Units      
Outstanding at beginning of period (in shares) 2,168,824 2,266,473 2,361,285
Granted (in shares) 583,958 350,769 552,250
Distributions (335,461) (440,548) (558,008)
Forfeited (in shares) (10,167) (7,870) (89,054)
Balance at End of Period (in shares) 2,407,154 2,168,824 2,266,473
Weighted Average Grant Date Fair Market Value      
Outstanding at beginning of period (usd per share) $ 16.20 $ 15.41 $ 14.46
Granted (usd per share) 16.11 19.62 19.31
Distributions (usd per share) 14.20 14.82 15.51
Forfeitures (usd per share) 16.60 19.06 11.18
Balance at End of Period (usd per share) $ 16.45 $ 16.20 $ 15.41