Derivative Financial Instruments - Summary of Outstanding Swaps (Detail) - USD ($)	1 Months Ended	6 Months Ended
	Dec. 31, 2018	Jun. 30, 2019	Jan. 31, 2017
Cross Currency Interest Rate Swap One [Member]
Derivative [Line Items]
Derivative Entered into		Dec. 10, 2018
Notional Amount		$ 240,000,000.0
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		$ 192,000,000.0
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		$ 108,000,000.0
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		$ 60,000,000.0
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	$ 600,000,000.0
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- BBA plus 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] | Euro [Member]
Derivative [Line Items]
Floating Leg		1 Month USD- LIBOR- BBA plus 2%
Interest Rate Swap One [Member] | 1-Month Libor [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		$ 50,000,000.0	$ 50,000,000.0
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