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Property and Equipment, Net - Summary of Depreciation and Amortization Expense Related to Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]      
Total depreciation and amortization expense $ 4,828 $ 4,751 $ 4,766
Operating expenses [Member]
      
Property, Plant and Equipment [Line Items]      
Total depreciation and amortization expense 4,497 4,444 4,427
Corporate general and administrative expenses [Member]
      
Property, Plant and Equipment [Line Items]      
Total depreciation and amortization expense $ 331 $ 307 $ 339