Income Tax (Benefit) Attributable to Income from Continuing Operations Differed from Amount Computed by Applying Statutory Federal income Tax Rate of 35% to Pre-Tax Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Tax at the statutory federal rate	$ 2,240	$ (135,078)	$ (20,899)
State income taxes (net of federal benefit)	224	(13,508)	(2,090)
Decrease (increase) in valuation allowance	(2,870)	94,505	28
Medicare Subsidy		(64)	623
Real estate investment trust income exclusion		(1,468)	(1,357)
Other	793	(45)	(154)
Total income tax (benefit) expense	$ 387	$ (55,658)	$ (23,849)

Income Tax (Benefit) Attributable to Income from Continuing Operations Differed from Amount Computed by Applying Statutory Federal income Tax Rate of 35% to Pre-Tax Income (Detail) (USD $)
In Thousands, unless otherwise specified

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Income Taxes [Line Items]

Tax at the statutory federal rate

$ 2,240

$ (135,078)

$ (20,899)

State income taxes (net of federal benefit)

224

(13,508)

(2,090)

Decrease (increase) in valuation allowance

(2,870)

94,505

Medicare Subsidy

(64)

623

Real estate investment trust income exclusion

(1,468)

(1,357)

Other

793

(45)

(154)

Total income tax (benefit) expense

$ 387

$ (55,658)

$ (23,849)

- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to pretax Income or Loss from continuing operations; income tax expense or benefit may include interest and penalties on tax uncertainties based on the entity's accounting policy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 45

-Paragraph 25

-URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32247-109318

Reference 3: 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.(h))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 45, 46

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Article 4

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 48

-Paragraph 15, 16, 19

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Amount of difference between income tax expense or benefit as reported in the income statement, and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to Medicare prescription drug benefits (subsidies).

+ References+ Details

- Definition

The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

+ References+ Details