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Unrecognized Compensation Cost (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost at beginning of period     $ 20,730  
Equity grants     1,496  
Equity grant forfeitures     (363)  
Equity compensation expense (2,261) (1,997) (7,415) (7,880)
Unrecognized Compensation Cost at End of Period 14,448   14,448  
Incentive Plans | Restricted Stock
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost at beginning of period     1,869  
Equity grants     94  
Equity grant forfeitures     (213)  
Equity compensation expense     (509)  
Unrecognized Compensation Cost at End of Period 1,241   1,241  
Incentive Plans | Deferred Stock Units
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost at beginning of period     13,044  
Equity grants     1,187  
Equity grant forfeitures     (150)  
Equity compensation expense     (4,549)  
Unrecognized Compensation Cost at End of Period 9,532   9,532  
Incentive Plans | Performance Stock Units
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost at beginning of period     5,817  
Equity compensation expense     (2,196)  
Unrecognized Compensation Cost at End of Period 3,621   3,621  
Employee Stock Purchase Plan
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity grants     215  
Equity compensation expense     (161)  
Unrecognized Compensation Cost at End of Period $ 54   $ 54