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Stockholders' Equity - Stockholder's Equity (Detail) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Common Stock, Beginning balance	29,554,500	29,554,500	29,555,000
Exercise of options, Common Stock	0	0	0
Stock purchases, Common Stock	0	0	0
Common Stock, Ending balance	29,554,500	29,554,500	29,554,500
Treasury Stock, Beginning balance	5,204,181	5,483,000	5,453,000
Exercise of options, Treasury Stock	(103,000)	(296,000)	(152,000)
Stock purchases, Treasury Stock	20,000	17,000	182,000
Ending balance, Treasury Stock	5,120,799	5,204,181	5,483,000

X

- Definition

Treasury Stock Issued During Period Shares Share Based Compensation Gross

+ References

No definition available.

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X

- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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- Definition

Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

+ References

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

+ References

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-Topic 210
-SubTopic 10
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Number of shares that have been repurchased during the period and are being held in treasury.

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