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Business and Basis of Presentation - Additional Information (Detail) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2019 Segment	Sep. 30, 2018 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number Of Reporting Units \| Segment		2
General and Administrative Expenses [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Decreases to general and administrative expenses	$ 0.4		$ 0.8
Acquisition Related Amortization and Remeasurement Expense [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Increases in acquisition related amortization and remeasurement expense	$ 0.4		$ 0.8