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Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total $ 1,696,482 $ 1,823,898
Money market funds (Cash and cash equivalents & restricted cash) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Financial assets, Fair Value 1,723,321 1,812,828
Level I [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total 1,723,321 1,812,828
Level I [Member] | Money market funds (Cash and cash equivalents & restricted cash) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Financial assets, Fair Value 1,723,321 1,812,828
Level II [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total (26,839) 11,070
Interest Rate Swap (Liability) Asset, net [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Financial assets, Fair Value   11,070
Financial liabilities, Fair Value (26,839)  
Interest Rate Swap (Liability) Asset, net [Member] | Level II [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Financial assets, Fair Value   $ 11,070
Financial liabilities, Fair Value $ (26,839)