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Discontinued Operations - Schedule of Condensed Cash Flow Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Discontinued Operations And Disposal Groups [Abstract]    
Deferred income taxes $ 2,461 $ 88,356
Depreciation and amortization of property, plant and equipment   1,607
Stock-based compensation   955
Expenditures for property, plant and equipment   273
Software and software development costs   $ 675