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Fair Value of Stock Settled Performance Units (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Performance Unit Awards 2013
 
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]  
Aggregate fair value at date of grant $ 5,564
Performance Unit Awards 2012
 
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]  
Aggregate fair value at date of grant 3,065
Performance Unit Awards 2011
 
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]  
Aggregate fair value at date of grant 5,569
Performance Unit Awards 2010
 
Schedule of Share based Compensation Arrangements by Share based Payment Award, Performance Options [Line Items]  
Aggregate fair value at date of grant $ 3,117