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Financial Instruments - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($) swap	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($) swap
Derivative [Line Items]
Derivative losses included in AOCI			$ 5,700,000
Net investment hedge ineffectiveness			0
Cash flow hedge ineffectiveness	$ 0		0
Derivative, Gain (Loss) on Derivative, Net	(3,932,000)	$ (9,273,000)	$ (3,006,000)	$ (12,888,000)
Foreign currency contract
Derivative [Line Items]
Term of derivative			12 months
Interest rate swaps
Derivative [Line Items]
Number of instruments terminated (swap) | swap		2		2
Deal Contingent Swaps | Interest expense | Interest rate swaps
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ 0	$ (24,937,000)	$ 0	$ (24,937,000)

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Gain (loss) on hedging derivative instrument or the foreign currency transaction gain (loss) on the nonderivative hedging instrument designated as a hedge of a net investment in foreign operations related to hedge ineffectiveness, which is included in earnings in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (d)(1)
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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

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