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Stockholders' Equity (Detail) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 23, 2000 | Aug. 31, 2007 | Dec. 31, 2017 | Dec. 31, 2016
Stockholders Equity [Line Items] |  |  |  |
Retained earnings from which dividends may not be paid without prior approval, total |  |  | $ 21.2 | $ 20.3
Employee Stock Purchase |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Number of options issued or activity |  | 0 |  |
Employee eligibility period |  |  | 1 year |
Employees to buy stock under options granted |  |  | 85.00% |
Options are vested when granted and will expire no later than |  |  | 27 months |
Common stock, capital shares reserved for future issuance |  |  | 48,011 |
Dividend Reinvestment And Stock Purchase Plan [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Employees to buy stock under options granted |  |  | 95.00% |
Shares of common stock purchased |  |  | 14,294 | 13,494
Common stock, capital shares reserved for future issuance |  |  | 157,351 |
Stockholder Purchase Plan [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Number of options issued or activity | 0 |  |  |
Options are vested when granted and will expire no later than |  |  | 3 months |
Common stock, capital shares reserved for future issuance |  |  | 313,919 |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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