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Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total fair value of plan assets [1] $ 45 $ 8,908
Supplemental Executive Retirement Plan    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets   8,909
Other pending transactions   (1)
Total fair value of plan assets 45 8,908
Supplemental Executive Retirement Plan | Measured At Net Asset Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets   1,725
Total fair value of plan assets 45 1,725
Supplemental Executive Retirement Plan | Quoted Prices In Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets   6,173
Other pending transactions   (1)
Total fair value of plan assets   6,172
Supplemental Executive Retirement Plan | Significant Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets   1,011
Total fair value of plan assets   1,011
Supplemental Executive Retirement Plan | Cash and Cash Equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets 45 246
Supplemental Executive Retirement Plan | Cash and Cash Equivalents | Measured At Net Asset Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets $ 45 49
Supplemental Executive Retirement Plan | Cash and Cash Equivalents | Quoted Prices In Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets   27
Supplemental Executive Retirement Plan | Cash and Cash Equivalents | Significant Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets   170
Supplemental Executive Retirement Plan | Equity Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets   5,295
Supplemental Executive Retirement Plan | Equity Securities | Quoted Prices In Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets   5,295
Supplemental Executive Retirement Plan | Debt Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets   3,368
Supplemental Executive Retirement Plan | Debt Securities | Measured At Net Asset Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets   1,676
Supplemental Executive Retirement Plan | Debt Securities | Quoted Prices In Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets   851
Supplemental Executive Retirement Plan | Debt Securities | Significant Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of plan assets   $ 841
[1] The company converted substantially all investments held in the rabbi trust to cash to fund a lump sum benefit to the former CEO in May 2018. Refer to Note (6) for more information regarding this payment.