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Revenue Recognition - Summary of Impact of Adopting Topic 606 on Condensed Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Revenue from Contract with Customers [Line Items]    
Inventories $ 51,491 $ 48,346
Other current assets 32,836 33,308
Total assets 863,106 738,746
Deferred income taxes 7,758 6,444
Retained earnings 88,736 48,434
Total liabilities and stockholders' equity 863,106 $ 738,746
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]    
Revenue from Contract with Customers [Line Items]    
Inventories 7,003  
Other current assets (10,689)  
Total assets (3,686)  
Deferred income taxes (921)  
Retained earnings (2,765)  
Total liabilities and stockholders' equity (3,686)  
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]    
Revenue from Contract with Customers [Line Items]    
Inventories 58,494  
Other current assets 22,147  
Total assets 859,420  
Deferred income taxes 6,837  
Retained earnings 85,971  
Total liabilities and stockholders' equity $ 859,420