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Available-For-Sale Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 13,273 $ 48,306
Gross Unrealized Gains 238 62
Gross Unrealized Losses    (2,376)
Estimated Fair Value 13,511 45,992
Mutual funds
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,975 [1] 1,975 [1]
Gross Unrealized Gains 198 [1] 48 [1]
Gross Unrealized Losses    [1]  
Estimated Fair Value 2,173 [1] 2,023 [1]
Commercial paper
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3,699 [2] 29,728 [2]
Gross Unrealized Gains   9 [2]
Gross Unrealized Losses    [2]  
Estimated Fair Value 3,699 [2] 29,737 [2]
Asset-backed securities and collateralized mortgage obligations
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 7,599 [3],[4],[5] 10,853 [3],[6]
Gross Unrealized Gains 40 [3],[4],[5]  
Gross Unrealized Losses    [3],[4],[5] (2,376) [3],[6]
Estimated Fair Value 7,639 [3],[4],[5] 8,477 [3],[6]
Corporate notes and bonds
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   5,750 [4],[7]
Gross Unrealized Gains   5 [4],[7]
Gross Unrealized Losses    [7]  
Estimated Fair Value   $ 5,755 [4],[7]
[1] Various U.S. equities and other investments managed under mutual funds.
[2] Commercial paper with maturities less than one year.
[3] Asset-backed and mortgage-backed securities with maturities of up to 26 years.
[4] Asset-backed and mortgage-backed securities and collateralized mortgage obligations contains a $1.6 million impairment that was recognized in the year ended December 31, 2013.
[5] Included in our asset-backed securities and collateralized mortgage obligations is approximately $5.6 million of commercial paper secured by mortgaged-backed securities.
[6] Included in our asset-backed securities and collateralized mortgage obligations is approximately $7.4 million of commercial paper secured by mortgaged-backed securities.
[7] Corporate notes and bonds with maturities of three years or less.