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Depreciation Expense Related to Property and Equipment (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Property, Plant and Equipment [Line Items]        
Depreciation expense $ 597 $ 3,165 $ 1,775 $ 8,282