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Accumulate Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Beginning balance $ 3,879 $ 1,122 $ 2,395 $ 2,548 $ 2,548 $ (2,237)  
Other comprehensive income (loss) before reclassification (263) 935 1,421 (461) 60 4,949  
Amount reclassified from accumulated other comprehensive income   (140) (200) (170) (213) (164)  
Period change (263) 795 1,221 (631) (153) 4,785 $ (7,628)
Ending balance $ 3,616 $ 1,917 $ 3,616 $ 1,917 $ 2,395 $ 2,548 $ (2,237)