Related Party Transactions - Additional Information (Detail) (USD $)	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Related Party Transaction Due From To Related Party [Line Items]
Dividend related to return on Capital on investment made	$ 951,000	$ 2,120,000
Nisco [Member]
Related Party Transaction Due From To Related Party [Line Items]
Joint Venture percentage	40.00%	40.00%
Sales to related party	10,850,000	11,570,000
Dividend received	1,760,000	4,000,000
Dividend related to earnings	809,000	1,880,000
Dividend related to return on Capital on investment made	951,000	2,120,000
Guyoung [Member]
Related Party Transaction Due From To Related Party [Line Items]
Joint Venture percentage	17.00%	20.00%
Dividend received	224,000
Dividend related to earnings	224
Total Purchases of materials	441,000	690,000
Unrealized gain on investment	1,849,000
Amortized cost of the investment	1,299,000
Fair value of investment	$ 3,148,000

Proceeds from equity method investment earning.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

Amount of dividend income on nonoperating securities.

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- Definition

Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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- Definition

Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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- Definition

Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities.

+ References

No definition available.

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- Definition

Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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