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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Accounting Policies [Abstract]            
Increase in costs and expenses after reclassification     $ 34,781   $ 68,578  
Costs and expenses $ 52,357   $ 56,862 $ 111,510 $ 113,661  
Deferred revenue 843     843   $ 265
Deferred evenue recognized into revenue   $ 265        
Unbilled revenue in accounts receivable $ 19,643     $ 19,643   $ 16,238