Debt - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Oct. 16, 2014	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014	Apr. 27, 2015	Dec. 28, 2014
Debt Instrument [Line Items]
Debt and capital lease obligations		$ 623,000		$ 623,000
Debt and capital lease obligations financed through publicly offered debt		273,900		273,900
Company's outstanding obligations for capital leases		$ 59,200		59,200
Refinanced under revolving credit facility				$ 100,000	$ 0
Weighted average interest rate on debt and capital lease obligations spot rate		4.30%	5.70%	4.30%	5.70%		5.80%
Overall weighted average interest rate on debt and capital lease obligations		4.30%	5.70%	4.80%	5.80%
Debt and capital lease obligations subject to changes in short-term interest rates		$ 290,000		$ 290,000
Line of Credit [Member]
Debt Instrument [Line Items]
Outstanding borrowing on uncommitted line of credit			$ 20,000		$ 20,000
Uncommitted line of credit, weighted average interest rate			0.90%		0.90%
Senior Notes [Member]
Debt Instrument [Line Items]
Maturity date of debt instruments				Jun. 01, 2016
Refinanced under revolving credit facility				$ 100,000
Senior notes, amount		164,800		164,800
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Unsecured revolving credit agreement		450,000	$ 200,000	450,000	$ 200,000		$ 350,000
Period of unsecured revolving credit agreement	5 years
Letters of credit		50,000		$ 50,000
Increase in maximum borrowing capacity						$ 100,000
Maturity date of debt instruments				Oct. 16, 2019
Annual facility fee, percentage				0.15%
Outstanding borrowing on uncommitted line of credit		290,000	$ 60,000	$ 290,000	$ 60,000		$ 71,000
Amount available to meet cash requirements under the revolving credit facility		$ 160,000		$ 160,000