Additional Loan Amount Drawn

No definition available.

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- Definition

Borrowing base of the face value of the tax lien collateralized notes.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Debt Instrument Term Extension Period

+ References

No definition available.

+ Details

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- Definition

Property Tax Payment Agreements Receivable, Net

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Property Tax Payment Agreements Receivable, Principal Balance

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- 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

Amount of assets pledged to secure a debt instrument.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

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-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The average effective interest rate during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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-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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Period Type:	duration

- Definition

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

+ References

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

+ Details

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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

The carrying value as of the balance sheet date of the current portion 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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Line-of-Credit Arrangement

-URI http://asc.fasb.org/extlink&oid=6517033

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20

-Article 5

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- Definition

Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ 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 210.5-02.22)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16(a))

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Debt - Propel Facilities (Detail) - USD ($)	3 Months Ended		9 Months Ended
Debt - Propel Facilities (Detail) - USD ($)	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	May. 06, 2014	May. 02, 2014	May. 15, 2013
Debt Instrument [Line Items]
Credit facility, outstanding amount	$ 576,000,000		$ 576,000,000		$ 505,000,000
Weighted average interest rate (percent)	3.25%	2.95%	3.12%	2.92%
Receivables secured by property tax liens, net	$ 297,592,000		$ 297,592,000		259,432,000
Term loan facility	140,141,000		140,141,000		146,023,000
Securitized notes	32,500,000		32,500,000		43,750,000
Texas [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate						1.44%
Receivables secured by property tax liens, net						$ 141,500,000
Receivable secured by property tax liens, principal amount						$ 134,000,000
Propel Term Loan Facility [Member]
Debt Instrument [Line Items]
Debt instrument, stated interest rate							5.50%
Term loan facility, outstanding	0		0
Convertible senior notes sold							$ 31,900,000.0
Receivables secured by property tax liens, net							$ 43,000,000
Secured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, collateral amount	88,200,000		88,200,000
Propel Facility I [Member]
Debt Instrument [Line Items]
Revolving credit facility	$ 80,000,000		$ 80,000,000
Borrowing base of the face value of the tax lien collateralized notes (percent)	90.00%		90.00%
Credit facility, outstanding amount	$ 63,000,000		$ 63,000,000
Weighted average interest rate (percent)	2.71%	3.15%	3.02%	3.34%
Propel Facility I [Member] \| Federal funds rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			0.50%
Propel Facility I [Member] \| One month LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
Propel Facility I [Member] \| Minimum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			2.70%
Propel Facility I [Member] \| Maximum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			3.20%
Propel Facility I [Member] \| Accordion feature [Member]
Debt Instrument [Line Items]
Revolving credit facility	$ 20,000,000.0		$ 20,000,000.0
Propel Facility II, Amended [Member]
Debt Instrument [Line Items]
Revolving credit facility	150,000,000.0		150,000,000.0					$ 100,000,000.0
Additional draws	$ 0		$ 0
Debt instrument, extension period			1 year
Propel Facility II, Amended [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			2.25%
Propel Facility II, Amended [Member] \| LIBOR [Member] \| Following Expiration Date [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			2.25%
Debt instrument, stated interest rate	4.00%		4.00%
Propel Facility II [Member]
Debt Instrument [Line Items]
Credit facility, outstanding amount	$ 91,500,000		$ 91,500,000
Weighted average interest rate (percent)	2.40%	3.94%	2.43%	3.80%
Propel securitized notes [Member]
Debt Instrument [Line Items]
Securitized notes	$ 71,923,000		$ 71,923,000		$ 104,247,000