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Summary of Performance-based Award Activity (Detail) - Jun. 30, 2015 - Performance Shares - USD ($)
Total
Number of shares  
Grants (at target) 66,650
Ending balance 66,650
Total unrecognized compensation expense remaining $ 924,000
Weighted-average years expected to be recognized over 2 years 6 months
Weighted-average grant date fair value  
Grants (at target) $ 14.84
Ending balance $ 14.84