Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended						1 Months Ended			3 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended
	Dec. 31, 2011 State	Dec. 25, 2010	Dec. 26, 2009	Dec. 31, 2011 State and Local Jurisdiction	Dec. 31, 2011 State and Local Jurisdiction Minimum	Dec. 31, 2011 State and Local Jurisdiction Maximum	Oct. 24, 2011 Massachusetts Department of Revenue	Oct. 31, 2009 Massachusetts Department of Revenue	Aug. 31, 2008 Massachusetts Department of Revenue	Dec. 31, 2011 Massachusetts Department of Revenue	Dec. 31, 2011 Other States	Dec. 25, 2010 Other States	Dec. 26, 2009 Other States	Oct. 31, 2011 IRS	Dec. 31, 2011 IRS	Sep. 30, 2011 IRS
Income Taxes [Line Items]
Interest and penalties included in provision for incomes taxes	$ 400,000	$ 700,000	$ 500,000
Accrued interest and penalties	1,000,000	3,700,000
Unrecognized tax benefits that would impact the effective tax rate if recognized	1,600,000	4,900,000
Income tax return examination				The Company's state income tax returns remain subject to examination for three or four years depending on the state's statute of limitations.				Examination to include the 2007 and 2008 corporate income tax returns	Examination of the Company's 2004, 2005 and 2006 corporate income tax returns					expanded the original examination to include the 2009 corporate income tax return		examination of the Company's 2007 and 2008 amended consolidated corporate income tax return and the related loss carry back claim to 2006
Income tax return examination status							Settled the 2004 to 2008 MA DOR examinations								The examination was in progress as of December 31, 2011.
Provisions (benefit) for income taxes from an audit settlement										(2,100,000)
Income tax return examination period					3 years	4 years
Number of other states auditing the Company	3
Unrecognized tax benefits, changes due to settlements	$ 3,561,000	$ 360,000									$ 0	$ 400,000	$ 0