Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Former Chief Executive Officer
Dec. 31, 2012
Chief Executive Officer
Commitments and Contingencies Disclosure [Line Items]              
Operating and capital leases with terms generally ranging       10 to 25 years      
Liability for deferred lease expenses       $ 38,297 $ 34,466    
Employment agreements initial term 3 years 2 years 3 years        
Amended and restated employment agreement, extended term   1 year 1 year       1 year
Consultancy period           2 years  
Consultancy period, end date           Apr. 30, 2014  
Amended and restated employment agreement, term             Apr. 01, 2014
Amended and restated employment agreement, prior written notice for term extension             6 months
Contribution payments (for plan year 2010 \ 2011)       2,410 2,311    
Liability recorded of approximately       $ 2,500