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Financial Instruments - Investments from Continuing Operations (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Short-term investments (available-for-sale), Cost $ 124,204  
Total investments, Cost 132,054 39,441
Short-term investments (available-for-sale), Gross Unrealized Gain 24  
Total investments, Gross Unrealized Gain 24 1
Short-term investments (available-for-sale), Gross Unrealized (Loss) (148)  
Total investments, Gross Unrealized (Loss) (624) (476)
Short-term investments (available-for-sale), Fair value 124,080  
Long-term investments (available-for-sale), Fair value 7,374 7,374
Total investments, Fair value 131,454 38,966
Municipal bond [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Short-term investments (available-for-sale), Cost 6,907  
Long-term investments (available-for-sale), Cost 7,850 7,850
Short-term investments (available-for-sale), Gross Unrealized Gain 1  
Long-term investments (available-for-sale), Gross Unrealized Gain 0 0
Short-term investments (available-for-sale), Gross Unrealized (Loss) (27)  
Long-term investments (available-for-sale), Gross Unrealized (Loss) (476) (476)
Short-term investments (available-for-sale), Fair value 6,881  
Long-term investments (available-for-sale), Fair value 7,374 7,374
Total investments, Fair value 14,255 7,374
Non-governmental debt securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Short-term investments (available-for-sale), Cost 98,828  
Short-term investments (available-for-sale), Gross Unrealized Gain 18  
Short-term investments (available-for-sale), Gross Unrealized (Loss) (109)  
Short-term investments (available-for-sale), Fair value 98,737  
Total investments, Fair value 98,737  
Treasury and federal agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Short-term investments (available-for-sale), Cost 18,469  
Short-term investments (available-for-sale), Gross Unrealized Gain 5  
Short-term investments (available-for-sale), Gross Unrealized (Loss) (12)  
Short-term investments (available-for-sale), Fair value 18,462  
Total investments, Fair value 18,462  
U.S. Treasury bills [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Short-term investments (available-for-sale), Cost   31,591
Short-term investments (available-for-sale), Gross Unrealized Gain   1
Short-term investments (available-for-sale), Gross Unrealized (Loss)   0
Short-term investments (available-for-sale), Fair value   $ 31,592