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Summary of Restricted Stock Units Activity (Detail) - Restricted Stock Units (RSUs)
9 Months Ended
Sep. 30, 2015
$ / shares
shares
Number of RSUs  
Number of RSUs granted | shares 238,000
Number of RSUs vested | shares 0
Number of RSUs forfeited or expired | shares (7,000)
Number of RSUs, Unvested, Ending balance | shares 231,000
Number of RSUs, Expected to vest | shares 214,500
Weighted average Grant-Date fair value  
Weighted average Grant-Date fair value, RSUs granted $ 19.74
Weighted average Grant-Date fair value, RSUs vested 0
Weighted average Grant-Date fair value, RSUs forfeited or expired 19.83
Weighted average Grant-Date fair value, Ending balance 19.74
Weighted average Grant-Date fair value, Expected to vest $ 19.74