Amount of repayments of foreign subsidiaries short-term debt due in next year.

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Amount of repayments of long-term debt due in next year.

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Line of credit facility maximum maturity period.

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Line of credit facility minimum maturity period.

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The amount of retained earnings available for dividend distribution as calculated in accordance with loan covenants.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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Earliest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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No definition available.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Debt - Additional Information (Detail) - USD ($)		12 Months Ended
Debt - Additional Information (Detail) - USD ($)	Jul. 10, 2015	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total debt		$ 332,623,000	$ 273,931,000
Revolving credit agreement		$ 125,000,000
Line of credit facility, Minimum maturity period		1 day
Line of credit facility, Maximum maturity period		180 days
Debt matures in 2016		$ 18,806,000
Debt matures in 2017		21,335,000
Debt matures in 2018		21,335,000
Debt matures in 2019		29,907,000
Debt matures in 2020		29,906,000
Debt matures after 2020		211,334,000
Amount of repayments of long-term debt due in next year		12,049,000
Amount of repayments of foreign subsidiaries short-term debt due in next year		$ 6,757,000
Minimum [Member]
Debt Instrument [Line Items]
Facility fee percentage		0.15%
Minimum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Spread rate		0.975%
Minimum [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Spread rate		0.00%
Maximum [Member]
Debt Instrument [Line Items]
Facility fee percentage		0.35%
Maximum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Spread rate		1.525%
Maximum [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Spread rate		0.525%
Unsecured Private Placement Notes [Member]
Debt Instrument [Line Items]
Total debt		$ 322,142,000
Unsecured Private Placement Notes [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Debt instrument interest rate percentage		3.86%
Maturity Dates		12 years
Unsecured Private Placement Notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument interest rate percentage		5.88%
Maturity Dates		13 years
Unsecured private placement 3.95% note [Member]
Debt Instrument [Line Items]
Total debt	$ 100,000,000	$ 100,000,000
Debt instrument interest rate percentage	3.95%	3.95%	3.95%
Maturity date range, start	Jul. 10, 2021
Maturity date range, end	Jul. 10, 2027
Multi currency revolving credit agreement [Member]
Debt Instrument [Line Items]
Revolving credit agreement		$ 125,000,000
Credit agreement secured date		Jul. 10, 2019
Debt Outstanding		$ 0
Letters of Credit Outstanding		4,700,000
Unused Revolving credit		120,300,000
Unrestricted retained earnings		119,891,000	$ 88,684,000
Debt of foreign subsidiaries Unsecured bank debt and Term Loan, foreign currency [Member]
Debt Instrument [Line Items]
Total debt		8,534,000
Debt of foreign subsidiaries Secured bank debt, foreign currency [Member]
Debt Instrument [Line Items]
Total debt		$ 1,947,000	$ 1,638,000