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Share-Based Compensation - Additional Information (Detail)
0 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Apr. 01, 2014
2014 Executive Officer Long-Term Incentive Program
Sep. 30, 2014
Stock Options
Sep. 30, 2014
Stock Options
Sep. 30, 2014
Restricted Stock
Sep. 30, 2014
Restricted Stock
Sep. 30, 2014
Restricted Stock Units (RSUs)
Sep. 30, 2014
Restricted Stock Units (RSUs)
Sep. 30, 2014
Performance Units
Apr. 01, 2014
Performance Units
2014 Executive Officer Long-Term Incentive Program
Sep. 30, 2014
Performance Units
2014 Executive Officer Long-Term Incentive Program
Apr. 01, 2014
Stock Appreciation Rights (SARs)
2014 Executive Officer Long-Term Incentive Program
Sep. 30, 2014
Stock Appreciation Rights (SARs)
2014 Executive Officer Long-Term Incentive Program
Apr. 01, 2014
Cash units
2014 Executive Officer Long-Term Incentive Program
Sep. 30, 2014
Cash units
2014 Executive Officer Long-Term Incentive Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share-based awards   223,944 594,943 49,124 422,269   84,554              
Share based awards forfeited           88,705   34,693            
Awards granted 234,536               99,933   97,752   36,851  
Cash-based awards, expiration period                     10 years      
Cash settled awards, shares forfeited                   35,620   34,842   13,134