Derivative Financial Instruments - Summary of Outstanding Swaps (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	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
Notional Amount	$ 600,000,000
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-BBA plus 2.0%
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