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Inventories - Components of Inventories Included within BA Segment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Work-in-process component parts $ 37,462 $ 39,150
Finished goods 11,159 11,116
Total inventory $ 48,621 $ 50,266