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Summary of Restricted Stock Units Activity (Detail) - Restricted Stock Units (RSUs)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Number of RSUs  
Number of RSUs granted | shares 245,000
Number of RSUs vested | shares 0
Number of RSUs forfeited | shares (11,000)
Number of RSUs, Unvested, Ending balance | shares 234,000
Number of RSUs, Expected to vest | shares 217,200
Weighted average Grant-Date fair value  
Weighted average Grant-Date fair value, RSUs granted | $ / shares $ 19.89
Weighted average Grant-Date fair value, RSUs vested | $ / shares 0
Weighted average Grant-Date fair value, RSUs forfeited | $ / shares 19.83
Weighted average Grant-Date fair value, Ending balance | $ / shares 19.89
Weighted average Grant-Date fair value, Expected to vest | $ / shares $ 19.88