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Operating Segments (Detail)
$ in Thousands
12 Months Ended
Feb. 07, 2013
segment
Dec. 31, 2015
USD ($)
segment
Dec. 31, 2014
USD ($)
segment
Dec. 31, 2013
USD ($)
Feb. 08, 2013
USD ($)
Segment Reporting [Abstract]          
Number of reportable segments | segment 3 2 2    
Segment Reporting Information [Line Items]          
Revenue from foreign sources   $ 18,772 $ 16,306 $ 12,665  
Other [Member]          
Segment Reporting Information [Line Items]          
Sales price of assets sold         $ 2,797
Gain on sale of discontinued operations     $ 878