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Fair Value Measurement - Summary of Marketable Securities Consist of Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Recorded Basis $ 5,909 $ 9,899
Recorded Basis 19,787 16,748
Long-Term Available-for-Sale [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cost 5,953 9,870
Gross Unrealized Gains (Losses) (44) 29
Recorded Basis 5,909 9,899
Corporate Bonds [Member] | Long-Term Available-for-Sale [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cost 1,879 9,111
Gross Unrealized Gains (Losses) (27) 28
Recorded Basis 1,852 9,139
Fair Value Category 2  
Municipal Bonds [Member] | Long-Term Available-for-Sale [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cost 4,074 292
Gross Unrealized Gains (Losses) (17) 1
Recorded Basis 4,057 293
Fair Value Category 2  
Held-to-Maturity [Member] | Corporate Bonds [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Held-to-maturity, Cost 0 467
Fair Value Category 2  
Held-to-maturity, Gross Unrealized Gains (Losses) 0 0
Held-to-maturity, Recorded Basis 0 467
Current Available-for-Sale [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cost 19,800 16,728
Gross Unrealized Gains (Losses) (13) 20
Recorded Basis 19,787 16,748
Current Available-for-Sale [Member] | Corporate Bonds [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cost 9,800 14,764
Gross Unrealized Gains (Losses) (13) 16
Recorded Basis 9,787 14,780
Fair Value Category 2  
Current Available-for-Sale [Member] | Municipal Bonds [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cost 0 409
Gross Unrealized Gains (Losses) 0 1
Recorded Basis 0 410
Fair Value Category 2  
Current Available-for-Sale [Member] | Variable Rate Demand Notes (VRDN) [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cost 10,000 0
Gross Unrealized Gains (Losses) 0 0
Recorded Basis 10,000 0
Fair Value Category 2  
Current Available-for-Sale [Member] | U.S. Treasuries [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cost 0 1,555
Gross Unrealized Gains (Losses) 0 3
Recorded Basis $ 0 $ 1,558
Fair Value Category 1