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Supplemental Information to Consolidated Statements of Cash Flows - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash Flow Supplemental Disclosures [Line Items]      
Restricted stock surrendered, in values   $ 1 $ 2
Restricted Stock Vested      
Cash Flow Supplemental Disclosures [Line Items]      
Tax benefit (deficiency) related to restricted stock compensation $ 500   $ (100)
Employees - including an executive officer      
Cash Flow Supplemental Disclosures [Line Items]      
Restricted stock surrendered, (in shares) 50,719 52,024 51,877
Restricted stock surrendered, in values $ 1,500 $ 400  
Employees - including an executive officer | Maximum      
Cash Flow Supplemental Disclosures [Line Items]      
Restricted stock surrendered, in values     $ 100