Long Term Debt Activity - Summary of Company's Interest Rate Swap Agreements Designated as Cash Flow Hedges (Detail) - Designated as Hedging Instrument - Cash Flow Hedging $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Debt Instrument [Line Items]
Estimated Fair Value	$ 17,280	[1]
Interest Rate Swap Agreement 1
Debt Instrument [Line Items]
Notional Amount	$ 175,000
Effective Date	Dec. 31, 2018
Pay Rate	2.75%
Receive Rate	1-Month LIBOR
Expiration Date	Dec. 31, 2022
Estimated Fair Value	$ 6,679	[1]
Interest Rate Swap Agreement 2
Debt Instrument [Line Items]
Notional Amount	$ 137,500
Effective Date	Dec. 31, 2018
Pay Rate	2.77%
Receive Rate	1-Month LIBOR
Expiration Date	Dec. 31, 2022
Estimated Fair Value	$ 5,364	[1]
Interest Rate Swap Agreement 3
Debt Instrument [Line Items]
Notional Amount	$ 137,500
Effective Date	Dec. 31, 2018
Pay Rate	2.75%
Receive Rate	1-Month LIBOR
Expiration Date	Dec. 31, 2022
Estimated Fair Value	$ 5,237	[1]

[1] Approximately $4,119 of the total is included in accounts payable and accrued expenses and $13,161 is included in other long-term liabilities on the condensed consolidated balance sheet as of June 30, 2019.