Valuation and Qualifying Accounts (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 16,995,668	$ 13,267,184	$ 10,622,274
Charged To Income	1,227,513	4,179,025	6,760,626
Business Acquisitions	0	0	0
Deductions	9,430,963	450,541	4,115,716
Balance at End of Year	8,792,218	16,995,668	13,267,184
Tax Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	32,370,365	27,992,622	28,270,571
Charged To Income	3,634,906	6,953,692	2,406,334
Charged To Equity	0	0	0
Deductions	2,702,163	2,575,949	2,684,283
Balance at End of Year	$ 33,303,108	$ 32,370,365	$ 27,992,622

Valuation allowances and reserves charged to equity.

No definition available.

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

+ Details

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- Definition

+ References

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- Definition

Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

+ References

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- Definition

+ References

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