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Stock-Based Compensation - Summary of Stock-Based Compensation Grants (Detail) (USD $)
6 Months Ended
Jun. 30, 2014
Stock Appreciation Rights [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock Awards Granted 3,340
Weighted-Average Grant Price Per Share $ 38.95
Time-Based Restricted Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock Awards Granted 54,216
Weighted-Average Grant Price Per Share $ 33.73
Performance-Based Restricted Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock Awards Granted 42,676
Weighted-Average Grant Price Per Share $ 33.72