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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
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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.

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