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Investments - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 29, 2012 Y | Dec. 31, 2011 Y
Schedule of Available-for-sale Securities [Line Items] |  |
Investments, maximum maturity period, years | 5 | 5
Unrealized gains, net of unrealized losses, on the investments in the bond portfolio | $ 1,407,000 | $ 786,000
Guarantee Payment Of Insurance Claims |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Letters of credit outstanding | 45,146,000 |
Current Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments providing collateral for letters of credit to guarantee insurance claims | 35,528,000 |
Non-Current Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments providing collateral for letters of credit to guarantee insurance claims | 14,634,000 |
Total non-current investments | $ 56,874,000 |

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- Definition The net amount of gross unrealized gains (losses) for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 + Details
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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5086-111524 + Details
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