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Summary of Significant Accounting Policies - Cash and Cash Equivalents and Restricted Cash (Details) - Successor - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Cash and Cash Equivalents [Line Items]            
Cash and cash equivalents $ 234,053   $ 150,045      
Restricted Cash and Cash Equivalents Items [Line Items]            
Restricted cash included in other long-term assets 1,354   2,611      
Total cash and cash equivalents and restricted cash included in the Statements of Cash Flows $ 235,407 $ 157,146 $ 152,656 $ 144,395 $ 131,602 $ 0