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Basis of Presentation of Interim Period Statements - Summary of Basic and Diluted Common Shares Outstanding (Detail) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]        
Weighted average number of basic shares outstanding 7,243 7,201 7,220 7,163
Effect of dilutive securities 162 161 130 177
Weighted average number of diluted shares outstanding 7,405 7,362 7,350 7,340