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Summary of Financial Statement Affected by Application of ASU 2014-09 and Related Amendments (Parenthetical) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Unearned revenue $ 1,597 [1] $ 4,889
GPT and CSZ-IC | Liabilities Held for Sale    
Revenue Initial Application Period Cumulative Effect Transition [Line Items]    
Unearned revenue $ 5,351  
[1] During 2018, unearned revenues associated with GPT and CSZ-IC were classified as liabilities held for sale. As of December 31, 2018, 5,351 in unearned revenues associated with GPT and CSZ-IC were classified as liabilities held for sale.