Significant Accounting Policies (Pre-Tax Income Attributable to Joint Ventures) (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 25, 2011	Sep. 26, 2010	Sep. 25, 2011	Sep. 26, 2010
Noncontrolling Interest [Line Items]
Total income before income taxes, net of noncontrolling interests	$ 16,029,000	$ 11,868,000	$ 59,825,000	$ 58,460,000
Noncontrolling interests	817,000	672,000	2,868,000	2,672,000
Total pre-tax income	16,846,000	12,540,000	62,693,000	61,132,000
Corporate Joint Venture [Member]
Noncontrolling Interest [Line Items]
Total income before income taxes, net of noncontrolling interests	1,377,000	1,146,000	4,693,000	4,240,000
Noncontrolling interests	817,000	672,000	2,868,000	2,672,000
Total pre-tax income	$ 2,194,000	$ 1,818,000	$ 7,561,000	$ 6,912,000