Derivative Financial Instruments - Summary of Outstanding Swaps (Detail) - USD ($)	1 Months Ended	3 Months Ended
	Dec. 31, 2018	Mar. 31, 2019	Jan. 31, 2017
Cross Currency Interest Rate Swap One [Member]
Derivative [Line Items]
Derivative Entered into		Dec. 10, 2018
Notional Amount		$ 240,000,000
Fixed Rate		2.315%
Settlement Dates		Quarterly on the last day of each December, March, June, and September
Cross Currency Interest Rate Swap One [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Fixed Rate		4.8255%
Cross Currency Interest Rate Swap One [Member] | USD [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Floating Leg		N/A
Cross Currency Interest Rate Swap One [Member] | Euro [Member]
Derivative [Line Items]
Floating Leg		N/A
Cross Currency Interest Rate Swap Two [Member]
Derivative [Line Items]
Derivative Entered into		Dec. 10, 2018
Notional Amount		$ 192,000,000
Fixed Rate		2.235%
Settlement Dates		Quarterly on the last day of each December, March, June, and September
Cross Currency Interest Rate Swap Two [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Fixed Rate		4.8255%
Cross Currency Interest Rate Swap Two [Member] | USD [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Floating Leg		N/A
Cross Currency Interest Rate Swap Two [Member] | Euro [Member]
Derivative [Line Items]
Floating Leg		N/A
Cross Currency Interest Rate Swap Three [Member]
Derivative [Line Items]
Derivative Entered into		Dec. 10, 2018
Notional Amount		$ 108,000,000
Fixed Rate		2.19%
Settlement Dates		Quarterly on the last day of each December, March, June, and September
Cross Currency Interest Rate Swap Three [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Fixed Rate		4.8255%
Cross Currency Interest Rate Swap Three [Member] | USD [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Floating Leg		N/A
Cross Currency Interest Rate Swap Three [Member] | Euro [Member]
Derivative [Line Items]
Floating Leg		N/A
Cross Currency Interest Rate Swap Four [Member]
Derivative [Line Items]
Derivative Entered into		Dec. 10, 2018
Notional Amount		$ 60,000,000
Fixed Rate		2.29%
Settlement Dates		Quarterly on the last day of each December, March, June, and September
Cross Currency Interest Rate Swap Four [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Fixed Rate		4.8255%
Cross Currency Interest Rate Swap Four [Member] | USD [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Floating Leg		N/A
Cross Currency Interest Rate Swap Four [Member] | Euro [Member]
Derivative [Line Items]
Floating Leg		N/A
Interest Rate Swap One [Member]
Derivative [Line Items]
Derivative Entered into	Dec. 04, 2018	Dec. 04, 2018
Notional Amount	$ 600,000,000	$ 600,000,000
Fixed Rate	4.8255%
Settlement Dates		Monthly on the last business day of each month commencing with December 31, 2018 in accordance with Modified Following Business Day Convention
Interest Rate Swap One [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Fixed Rate		4.8255%
Interest Rate Swap One [Member] | USD [Member]
Derivative [Line Items]
Floating Leg		1 Month USD-LIBOR-BBAplus 2%
Interest Rate Swap One [Member] | USD [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Floating Leg		Variable rate 1- month USD LIBOR plus 2%
Interest Rate Swap One [Member] | 1-Month Libor [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Derivative basis spread on variable rate, thereafter		2.00%
Interest Rate Swap One [Member] | 1-Month Libor [Member] | USD [Member]
Derivative [Line Items]
Derivative variable interest rate		2.00%
Interest Rate Swap Two [Member]
Derivative [Line Items]
Derivative Entered into		Jan. 31, 2017
Notional Amount		$ 50,000,000	$ 50,000,000
Fixed Rate			1.625%
Settlement Dates		Monthly on the last banking day of each month commencing February 28, 2017
Interest Rate Swap Two [Member] | USD [Member]
Derivative [Line Items]
Fixed Rate		1.625%
Interest Rate Swap Two [Member] | USD [Member] | Swap Counterparty [Member]
Derivative [Line Items]
Floating Leg		Variable rate 1- month USD LIBOR
Interest Rate Swap Two [Member] | Euro [Member]
Derivative [Line Items]
Floating Leg		N/A