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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
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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) |

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