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Restructuring Charges - Reconciliation of Beginning and Ending Liability Balances by Major Restructuring Activity (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Restructuring Cost and Reserve [Line Items]        
Balance at January 1, 2013     $ 7,224  
Restructuring charges 773 678 1,493 2,903
Restructuring liabilities     2,341 1,938
Balance at June 30, 2013 6,376   6,376  
Marketing & Events Group [Member]
        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 318 484 124 2,487
Marketing & Events Group [Member] | Severance & Employee Benefits [Member]
        
Restructuring Cost and Reserve [Line Items]        
Balance at January 1, 2013     720  
Restructuring charges     173  
Restructuring liabilities     (993)  
Balance at June 30, 2013 1,430   1,430  
Marketing & Events Group [Member] | Facilities [Member
        
Restructuring Cost and Reserve [Line Items]        
Balance at January 1, 2013     5,571  
Restructuring charges     440  
Restructuring liabilities     (1,094)  
Balance at June 30, 2013 4,917   4,917  
Other Restructurings [Member] | Severance & Employee Benefits [Member]
        
Restructuring Cost and Reserve [Line Items]        
Balance at January 1, 2013         
Restructuring charges     42  
Restructuring liabilities     (13)  
Balance at June 30, 2013 29   29  
Other Restructurings [Member] | Facilities [Member
        
Restructuring Cost and Reserve [Line Items]        
Balance at January 1, 2013     933  
Restructuring charges     (692)  
Restructuring liabilities     (241)  
Balance at June 30, 2013