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Fair Value Measurement - Summary of Restricted Marketable Securities Component and Workers' Compensation Deposits (Detail) (Available-for-sale Securities [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cost $ 10,378 $ 8,735
Gross Unrealized Gains 15 22
Recorded Basis 10,393 8,757
Municipal Bonds [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cost 4,742 4,920
Gross Unrealized Gains 10 17
Recorded Basis 4,752 4,937
Fair Value Category 2  
Corporate Bonds [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cost 2,849 2,035
Gross Unrealized Gains 5 5
Recorded Basis 2,854 2,040
Fair Value Category 2  
U.S. Treasuries [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cost 2,787 1,780
Gross Unrealized Gains 0 0
Recorded Basis $ 2,787 $ 1,780
Fair Value Category 1