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Discontinued Operations - Additional Information (Detail) - Mode [Member] - Discontinued Operations Disposed of By Sale [Member]
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]  
Net cash (used in) provided by operating activities $ 4.3
Net cash provided by (used in) investing activities $ 245.3