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Cash, Cash Equivalents, and Investments - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jul. 01, 2012
Jun. 30, 2013
Jul. 01, 2012
Jun. 30, 2013
Equity Securities [Member]
Dec. 31, 2012
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]            
Fair value         $ 1,669,000 $ 2,131,000
Gross unrealized loss     462,000   462,000  
Gross realized gains on sale of investments 101,000 1,233,000 150,000 1,327,000    
Gross realized losses on sale of investments 49,000 238,000 67,000 238,000    
Maximum amount committed to invest in limited partnership     20,500,000      
Contribution to limited partnership 19,886,000   19,886,000      
Remaining amount of commitment in limited partnership 614,000   614,000      
Investment expiration date     Dec. 31, 2013      
Number of contributions made during the period     0      
Cash distribution received $ 1,285,000