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Revenue Recognition - Summary of Impact of Adoption to Condensed Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Assets:    
Contract assets $ 3,000  
Current liabilities:    
Deferred revenue 7,320 $ 14,574
Stockholders' equity:    
Retained earnings 250,068 238,953
Accounting Standards Update 2014-09    
Assets:    
Contract assets 3,000  
Current liabilities:    
Deferred revenue 7,320  
Deferred income tax liabilities 786  
Stockholders' equity:    
Retained earnings 250,068  
Accounting Standards Update 2014-09 | Balances without adoption of Topic 606    
Current liabilities:    
Deferred revenue 7,263  
Stockholders' equity:    
Retained earnings 247,854 241,167
Accounting Standards Update 2014-09 | Adjustment Due to Adoption of Topic 606    
Assets:    
Contract assets 3,000  
Current liabilities:    
Deferred revenue 57  
Deferred income tax liabilities 786  
Stockholders' equity:    
Retained earnings $ 2,214 $ 2,214