Future Operating Lease Commitments (Detail) (USD $)	Dec. 31, 2011
Schedule of Operating Leases [Line Items]
2012	$ 254,888,000
2013	215,187,000
2014	170,408,000
2015	129,099,000
2016	90,048,000
Thereafter	641,413,000
Total minimum lease payments	$ 1,501,043,000