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Depreciation and Amortization Expense Related to Property and Equipment (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Property, Plant and Equipment [Line Items]        
Depreciation and amortization expense $ 3,165 $ 2,449 $ 8,282 $ 4,972