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Acquisitions and Divestitures - Acquisition and Divestiture Related Expenses (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
General and Administrative Expense [Member]        
Business Acquisition [Line Items]        
Business Acquisition and Divestiture, Related Expenses $ 12,833 $ 82 $ 16,655 $ 969