Investments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2013 Securities	Dec. 29, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Total realized gains on sales of AFS securities	$ 64,637	$ 23,772	$ 35,864
Total realized losses on sales of AFS securities	16,868	13,386	15,978
Other-than-temporary impairment losses	0	0	6,082
Number of AFS securities issues contributing to total unrealized loss	262
Total, Unrealized Losses	17,766	15,500
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairment losses			6,082
Total, Unrealized Losses	3,900	12,499
Debt securities
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairment losses			$ 0