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Summary of Significant Accounting Policies - Schedule of Cash and Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Accounting Policies [Abstract]        
Cash and cash equivalents $ 4,954,740 $ 3,685,618 $ 2,236,424 $ 3,367,914
Restricted cash 128,006 192,551 146,822 155,323
Restricted cash, net of current portion 365,547 398,219 399,992 441,722
Total as presented in the consolidated statements of cash flows $ 5,448,293 $ 4,276,388 $ 2,783,238 $ 3,964,959