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Derivative Financial Instruments - Summary of Effect of Derivative Financial Instruments on Consolidated Statements of Operations (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Total interest and related expenses $ 97,955 $ 67,891 $ 255,677 $ 168,917
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income 152   388  
Interest Rate Swaps/Derivatives [Member] | Cash Flow Hedges [Member] | Interest Expense [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income 152,000   388,000  
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 $ 7,600   $ 21,000