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Summary of Performance-based Award Activity (Detail) - Performance Shares
 6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Number of shares  
Beginning balance | shares 66,150 [1]
Grants | shares 82,000 [1]
Cancellations | shares (1,691) [1]
Ending balance | shares 146,459 [1]
Total unrecognized compensation expense remaining | $ $ 1,734,900 [1]
Weighted-average years expected to be recognized over 2 years 1 month 6 days [1]
Weighted-average grant date fair value  
Beginning balance | $ / shares $ 14.84
Grants | $ / shares 15.69
Cancellations | $ / shares 14.84
Ending balance | $ / shares $ 15.32
[1] Represents the target number of shares to be issued for each performance-based award.