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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
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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

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