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Capital Lease Obligations - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Debt Disclosure [Abstract]        
Interest expense related to capital leases $ 426 $ 452 $ 913 $ 1,090