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Stock-Based Compensation - Unrecognized Compensation Cost Related to Unexercisable Options and Unvested Restricted Stock and Weighted Average Remaining Period (Detail) - Jun. 30, 2015 - USD ($)
$ in Thousands
Total
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Abstract]  
Remaining expense $ 4,698
Weighted average term 1 year 3 months 22 days