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Assumptions Used to Estimate Fair Value of Stock Options Granted (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, Options/SAR units granted	104,000	[1]
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, Options/SAR units granted	0
[1] In 2016, the Company granted 104,000 stock options only to non-employee directors of the Company. No SARs were granted during 2016.

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Options and Stock Appreciation Rights Grants in Period

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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