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Capital Transactions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 08, 2016 | Mar. 03, 2015 | Apr. 03, 2016 | Mar. 29, 2015 | Jul. 03, 2016 | Jun. 28, 2015 | Jul. 01, 2016 | Jun. 26, 2015
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |
Performance Unit Award Agreement expense recognized |  |  |  |  | $ 2,896 | $ 2,980 |  |
Share price |  |  |  |  |  |  | $ 144.82 | $ 148.98
Class B Common Stock [Member] |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |
Performance units awarded | 40,000 | 40,000 |  |  |  |  |  |
Performance units awards settled in cash | 19,080 | 19,080 |  |  |  |  |  |
Increase in total number of shares outstanding |  |  | 20,920 | 20,920 | 20,920 | 20,920 |  |

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