Derivative Financial Instruments - Summary of Effect of Derivative Financial Instruments on Consolidated Statements of Operations (Parenthetical) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest and related expenses	$ 359,625,000	$ 234,870,000	$ 184,270,000
Amount of Loss Reclassified from Accumulated OCI into Income	563,000	(831,000)	(798,000)
Interest Rate Swaps/Derivatives [Member] | Cash Flow Hedges [Member] | Interest Expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of Loss Reclassified from Accumulated OCI into Income	563,000	(831,000)	(798,000)
Foreign Currency Contracts [Member] | Net Investment Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net cash settlements on our foreign currency forward contracts		$ 14,200,000
Net cash settlements received	$ 29,100,000		$ 26,800,000