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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
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations [Abstract]        
Cash and cash equivalents $ 97,557 $ 134,758 $ 116,328 $ 69,418
Restricted cash 4,787 4,826 2,825 2,475
Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 102,344 $ 139,584 $ 119,153 $ 71,893