Financial Instruments Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 30, 2012	Dec. 25, 2011
Assets:
Employee compensation related investments	$ 23,043	$ 17,224
Sundry investments	29,090	26,162
Total Assets	52,133	43,386
Liabilities:
Contingent consideration payable	26,170	15,808
Total Liabilities	26,170	15,808
Fair Value, Inputs, Level 1
Assets:
Employee compensation related investments	23,043	17,224
Sundry investments	29,090	26,162
Total Assets	52,133	43,386
Liabilities:
Contingent consideration payable	0	0
Total Liabilities	0	0
Fair Value, Inputs, Level 2
Assets:
Employee compensation related investments	0	0
Sundry investments	0	0
Total Assets	0	0
Liabilities:
Contingent consideration payable	0	0
Total Liabilities	0	0
Fair Value, Inputs, Level 3
Assets:
Employee compensation related investments	0	0
Sundry investments	0	0
Total Assets	0	0
Liabilities:
Contingent consideration payable	26,170	15,808
Total Liabilities	$ 26,170	$ 15,808