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Fair Value of Financial Instruments - Schedule of Interest Rate Swaps Outstanding (Detail) - Interest Rate Swaps [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Aggregate Notional Amount	$ 862,853		$ 862,853		$ 800,293
Gross Asset at Fair Value	1,517		1,517		12,159
Gross Liability at Fair Value	28,356		28,356		$ 1,089
Gross gains		$ 2,747	155	$ 12,410
Gross losses	$ 18,521	$ 1,170	$ 37,964	$ 1,205

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

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-SubTopic 20
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Amount of increase in the fair value of derivatives recognized in the income statement.

+ References

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- Definition

Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

+ References

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Amount of decrease in the fair value of derivatives recognized in the income statement.

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No definition available.

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