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Impairment - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Impaired Long-Lived Assets Held and Used [Line Items]      
Impairment of Long-Lived Assets Held-for-use $ 6,100 $ 6,083 $ 0