Fair Value Measurements - Additional Information (Detail) (USD $)	3 Months Ended
Mar. 31, 2015 Company Lenders	Mar. 31, 2014	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Interest and dividends	$ 109,000	$ 274,000
Mark-to-market gain	1,400,000	429,000
Allowance for doubtful accounts on accounts receivable	2,982,000		2,719,000
Number of financial institutions included in counter parties	17
Number of secured lenders not in banking credit facility	2
Net derivative assets	$ 27,200,000

Number of counter parties not included in bank credit facility.

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Number of financial institutions included in counterparties.

+ References

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- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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- Definition

Fair value of credit risk derivative asset.

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- Definition

Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on trading securities and other forms of securities that provide ownership interests.

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Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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