Restatement of Previously Issued Financial Statements (Summary of Corrections by Financial Statement Line Item) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 25, 2012		Mar. 27, 2011		Dec. 25, 2011	Dec. 26, 2010
As Previously Reported [Member]
Consolidated Statement of Stockholders' Equity
Retained earnings	$ 315,551		$ 259,579		$ 298,807	$ 243,152
Noncontrolling interests in subsidiaries	9,895		7,899		8,569	8,506
Total stockholders' equity	227,835		223,416		218,222	207,200
Condensed Consolidated Balance Sheet
Noncurrent deferred income tax liabilities (assets)	7,264		1,138
Noncurrent deferred income tax liabilities					9,147
Long-term accrued income taxes	3,993
Other long-term liabilities	23,795		12,219		25,611
Retained earnings	315,551		259,579		298,807	243,152
Noncontrolling interests in subsidiaries	9,895		7,899		8,569	8,506
Total stockholders' equity	227,835		223,416		218,222	207,200
Condensed Consolidated Statement of Comprehensive Income
Interest expense (income)	288		608
Income before income taxes	27,138		26,780
Income tax expense	9,068		9,231
Net income, including noncontrolling interests	18,070		17,549
Net income, net of noncontrolling interests	16,744		16,427
Comprehensive income	18,281		18,822
Basic earnings per common share	$ 0.70		$ 0.64
Earnings per common share - assuming dilution	$ 0.69		$ 0.64
Consolidated Statement of Cash Flows
Net income, including noncontrolling interests	18,070		17,549
Deferred income taxes	(1,057)		2,664
Other	678		43
Net cash provided by operating activities	44,093		26,687
Reclassifications [Member]
Condensed Consolidated Balance Sheet
Long-term accrued income taxes	(3,993)	[1]
Other long-term liabilities	3,993	[1]
Scenario, Adjustment [Member]
Consolidated Statement of Stockholders' Equity
Retained earnings	(3,769)		(3,537)		(4,006)	(3,086)
Noncontrolling interests in subsidiaries	(9,895)		(7,899)		(8,569)	(8,506)
Total stockholders' equity	(13,664)		(11,436)		(12,575)	(11,592)
Condensed Consolidated Balance Sheet
Noncurrent deferred income tax liabilities (assets)	(2,310)		(2,168)
Noncurrent deferred income tax liabilities					(2,455)
Other long-term liabilities	11,197		10,458		11,065
Redeemable noncontrolling interests	4,777		3,146		3,965
Retained earnings	(3,769)		(3,537)		(4,006)	(3,086)
Noncontrolling interests in subsidiaries	(9,895)		(7,899)		(8,569)	(8,506)
Total stockholders' equity	(13,664)		(11,436)		(12,575)	(11,592)
Condensed Consolidated Statement of Comprehensive Income
Interest expense (income)	(382)		727
Income before income taxes	382		(727)
Income tax expense	145		(276)
Net income, including noncontrolling interests	237		(451)
Net income, net of noncontrolling interests	237		(451)
Comprehensive income	237		(451)
Basic earnings per common share	$ 0.01		$ (0.01)
Earnings per common share - assuming dilution			$ (0.02)
Consolidated Statement of Cash Flows
Net income, including noncontrolling interests	237		(451)
Deferred income taxes	145		(276)
Other	(382)		727
As Restated [Member]
Consolidated Statement of Stockholders' Equity
Retained earnings	311,782		256,042		294,801	240,066
Total stockholders' equity	214,171		211,980		205,647	195,608
Condensed Consolidated Balance Sheet
Noncurrent deferred income tax liabilities (assets)	4,954		(1,030)
Noncurrent deferred income tax liabilities	4,954				6,692
Other long-term liabilities	38,985		22,677		36,676
Redeemable noncontrolling interests	4,777		3,146		3,965
Retained earnings	311,782		256,042		294,801	240,066
Total stockholders' equity	214,171		211,980		205,647	195,608
Condensed Consolidated Statement of Comprehensive Income
Interest expense (income)	(94)		1,335
Income before income taxes	27,520		26,053
Income tax expense	9,213		8,955
Net income, including noncontrolling interests	18,307		17,098
Net income, net of noncontrolling interests	16,981	[2]	15,976	[2]
Comprehensive income	18,518		18,371
Basic earnings per common share	$ 0.71		$ 0.63
Earnings per common share - assuming dilution	$ 0.69		$ 0.62
Consolidated Statement of Cash Flows
Net income, including noncontrolling interests	18,307		17,098
Deferred income taxes	(912)		2,388
Other	296		770
Net cash provided by operating activities	$ 44,093		$ 26,687

[1] Amounts have been reclassified from the originally filed presentation in order to conform to the presentation included in the Form 10-K for the fiscal year ended December 30, 2012, and are not associated with the restatement adjustments.

[2] Net income at March 25, 2012 and March 27, 2011 is net of $1,326 and $1,122, respectively, allocable to the redeemable noncontrolling interests for our joint venture arrangements.