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Basis of Presentation and Significant Accounting Policies - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations [Abstract]        
Cash and cash equivalents $ 385,474 $ 134,758 $ 63,897 $ 69,418
Restricted cash 4,787 4,826 3,111 2,475
Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 390,261 $ 139,584 $ 67,008 $ 71,893