Long-Term Debt - Additional Information (Detail) (USD $)	9 Months Ended
Sep. 30, 2013
First Amendment \| Rantoul Partners
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 50,000,000
Second Amendment
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity	7,000,000
Second Amendment \| Minimum
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Increase	3.75%
Third Amendment
Debt Instrument [Line Items]
Line of Credit Facility, Increase, Additional Borrowings	12,150,000
Provision To Repurchase Common Stock	2,000,000
Fourth Amendment
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity	19,500,000
Fifth Amendment
Debt Instrument [Line Items]
Line of credit facility, current borrowing capacity	100,000,000
Line of Credit Facility, Increase, Additional Borrowings	38,000,000
Line of Credit
Debt Instrument [Line Items]
Line of credit facility, borrowed amount	29,500,000
Line of credit facility, excess liquidity	$ 8,500,000
Line of Credit \| Federal Funds Rate
Debt Instrument [Line Items]
Debt instrument interest rate, margin	0.50%
Line of Credit \| Base Rate \| Minimum
Debt Instrument [Line Items]
Debt instrument interest rate, margin	0.00%
Line of Credit \| Base Rate \| Maximum
Debt Instrument [Line Items]
Debt instrument interest rate, margin	0.75%
Line of Credit \| Floating Rate \| Minimum
Debt Instrument [Line Items]
Debt instrument interest rate, margin	2.25%
Line of Credit \| Floating Rate \| Maximum
Debt Instrument [Line Items]
Debt instrument interest rate, margin	3.00%
Line of Credit \| Fifth Amendment \| Federal Funds Rate
Debt Instrument [Line Items]
Debt instrument interest rate, margin	3.30%

Amount of provision permitting the repurchase of common stock.

No definition available.

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Balance Type:	debit
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- Definition

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

+ References

No definition available.

+ Details

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- Definition

When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Details

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Balance Type:	credit
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- Definition

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.

+ References

+ Details

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- Definition

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

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

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