Financial Instruments and Fair Value Measurements - Carrying Value and Estimated Fair Values (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Carrying Amount
Financial liabilities:
Interest rate swap	$ 27,401	$ 14,452
Carrying Amount | Credit Facility | 2023 Term A Loan
Financial liabilities:
Senior secured term loan	196,693	207,261
Carrying Amount | Credit Facility | 2024 Term B Loan
Financial liabilities:
Senior secured term loan	308,401	317,936
Fair Value
Financial liabilities:
Interest rate swap	27,401	14,452
Fair Value | Credit Facility | 2023 Term A Loan
Financial liabilities:
Senior secured term loan	185,366	206,388
Fair Value | Credit Facility | 2024 Term B Loan
Financial liabilities:
Senior secured term loan	$ 264,108	$ 324,163