Fair Value Measurements - Outstanding Interest Rate Swaps (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	May 31, 2019	Mar. 31, 2019	May 31, 2018	Aug. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Mar. 31, 2017	Feb. 28, 2017
US Dollar term loan floating-to-fixed rate swaps maturing on July 2020
Derivative Instruments Gain Loss [Line Items]
Notional Amount	$ 250,000,000								$ 250,000,000
Maturity Date	2020-07
US Dollar term loan floating-to-fixed rate swaps maturing on July 2020
Derivative Instruments Gain Loss [Line Items]
Notional Amount	$ 250,000,000						$ 250,000,000
Maturity Date	2020-07
US Dollar term loan floating-to-fixed rate swaps maturing on October 2020
Derivative Instruments Gain Loss [Line Items]
Notional Amount	$ 250,000,000					$ 250,000,000
Maturity Date	2020-10
US Dollar term loan floating-to-fixed rate swaps maturing on October 2021
Derivative Instruments Gain Loss [Line Items]
Notional Amount	$ 250,000,000				$ 250,000,000
Maturity Date	2021-10
US Dollar term loan floating-to-fixed rate swaps maturing on July 2022
Derivative Instruments Gain Loss [Line Items]
Notional Amount	$ 250,000,000							$ 250,000,000
Maturity Date	2022-07
US Dollar term loan floating-to-fixed rate swaps maturing on April 2023
Derivative Instruments Gain Loss [Line Items]
Notional Amount	$ 150,000,000		$ 150,000,000
Maturity Date	2023-04
US Dollar term loan floating-to-fixed rate swaps maturing on May 2023
Derivative Instruments Gain Loss [Line Items]
Notional Amount	$ 250,000,000			$ 250,000,000
Maturity Date	2023-05
US Dollar term loan floating-to-fixed rate swaps maturing on June 2023
Derivative Instruments Gain Loss [Line Items]
Notional Amount	$ 250,000,000		$ 250,000,000
Maturity Date	2023-06
US Dollar term loan floating-to-fixed rate swaps maturing on July 2023
Derivative Instruments Gain Loss [Line Items]
Notional Amount	$ 150,000,000	$ 150,000,000
Maturity Date	2023-07