Derivative Financial Instruments - Summary of Effect of Derivative Financial Instruments on Consolidated Statements of Operations (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivatives	$ 40,364,000	$ (21,459,000)	$ 25,444,000
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	563,000	(831,000)	(798,000)
Net Investment [Member] | Foreign Currency Contracts [Member] | Interest Expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivatives	40,372,000	(22,216,000)	25,355,000
Cash Flow Hedges [Member] | Interest Rate Swaps/Derivatives [Member] | Interest Expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	563,000	(831,000)	(798,000)
Cash Flow Hedges [Member] | Interest Rate Swaps/Derivatives [Member] | Interest Income (Expense) [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Gain (Loss) Recognized in OCI on Derivatives	(8,000)	757,000	89,000
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income	$ 563,000	$ (831,000)	$ (798,000)