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Stock-Based Compensation - Summary of Stock-Based Compensation Grants (Detail)
6 Months Ended
Jun. 30, 2016
$ / shares
shares
Time Based Restricted Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock Awards Granted | shares 47,708
Weighted-Average Grant Price Per Share | $ / shares $ 35.22
Performance Based Restricted Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock Awards Granted | shares 44,925
Weighted-Average Grant Price Per Share | $ / shares $ 35.83