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Stock-Based Compensation Plans - Additional Information (Detail) - Plans
3 Months Ended 6 Months Ended
Mar. 31, 2014
Jun. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Active equity-based stock plans   1
Maximum    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Actual payout of shares on performance units granted   150.00%
Minimum    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Actual payout of shares on performance units granted   0.00%
Stock Appreciation Rights (SARs)    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Vesting period   3 years
Stock Appreciation Rights (SARs) | Maximum    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Expiration term of stock units   5 years
Restricted Stock    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Vesting period   3 years
Performance Shares    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Vesting period 3 years 3 years