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Summary of Restricted Stock Units Activity (Detail) - Restricted Stock Units (RSUs)
6 Months Ended
Jun. 30, 2016
$ / shares
shares
Number of RSUs  
Number of RSUs, Unvested, Beginning balance | shares 234,000
Number of RSUs granted | shares 338,100
Number of RSUs vested | shares (64,640)
Number of RSUs Forfeited or expired | shares (3,967)
Number of RSUs, Unvested, Ending balance | shares 503,493
Number of RSUs, Expected to vest | shares 463,214
Weighted Average Grant-Date Fair Value  
Weighted Average Grant-Date Fair Value, Beginning balance | $ / shares $ 19.89
Weighted Average Grant-Date Fair Value, RSUs granted | $ / shares 20.79
Weighted Average Grant-Date Fair value, RSUs vested | $ / shares 19.83
Weighted Average Grant-Date Fair Value, RSUs Forfeited or expired | $ / shares 20.25
Weighted Average Grant-Date Fair Value, Ending balance | $ / shares 20.50
Weighted Average Grant-Date Fair Value, Expected to vest | $ / shares $ 20.49