Fair Value of Financial Instruments - Additional Information (Detail) $ in Millions	1 Months Ended
	Jul. 31, 2017 Agreement	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Number of interest rate cap agreement acquired | Agreement	1
Interest Rate Cap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate derivative instrument cost		$ 0.2	$ 0.2
Fair value of interest rate derivative instrument		$ 0.0	$ 0.0