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Stock-based Compensation - Stock Option Activity (Detail) - $ / shares
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Outstanding(in shares) 31,949 46,451 46,451 58,581
Expired (in shares) 0 (3,639) (10,802) 0
Exercised (in shares) 0 (1,025) (2,175) (11,223)
Forfeited (in shares)     (1,525) (907)
Outstanding (in shares) 31,949 41,787 31,949 46,451
Exercisable (in shares) 31,949 41,787 31,949 46,451
Outstanding (in dollars per share) $ 25.03 $ 27.90 $ 27.90 $ 28.38
Expired (in dollars per share) 0.00 37.33 36.93 0.00
Exercised (in dollars per share) 0.00 20.21 21.31 30.45
Forfeited (in dollars per share)     33.53 27.35
Outstanding (in dollars per share) 25.03 27.27 25.03 27.90
Exercisable (in dollars per share) $ 25.03 $ 27.27 $ 25.03 $ 27.90