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Sale of Property - Additional Information (Detail)
$ in Thousands, £ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2016
GBP (£)
Jan. 31, 2017
USD ($)
Gain (Loss) on Disposition of Property Plant Equipment [Abstract]      
Proceeds from Sale of UK Property $ 500 £ 0.4 $ 474
Gain on sale of property $ 400   $ 419