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Stock Option Activity (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Number of Shares    
Options outstanding at beginning of period 75,000 127,144
Cancelled (75,000) (52,144)
Options outstanding at end of period   75,000
Weighted Average Exercise Price    
Options outstanding at beginning of period $ 20.69 $ 20.20
Cancelled $ 20.69 19.50
Options outstanding at end of year   $ 20.69