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Benefit Plans - Schedule of Fair Value Hierarchy, the Company's Pension Plan Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Total $ 5,078 $ 3,693 $ 4,264
Cash and equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Total 5,078 3,693  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total 5,078 3,693  
Level 1 | Cash and equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Total 5,078 3,693  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total 0 0  
Level 2 | Cash and equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Total 0 0  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total 0 0  
Level 3 | Cash and equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Total $ 0 $ 0