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Fair Value Measurements - Schedule of Fair Value Information for Financial Assets and Liabilities Carried on Balance Sheet (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financial Assets:
Limited partnership investments	$ 22,716	$ 2,550
ADC Arrangement classified as real estate investment	6,285	2,888
Portion at Other than Fair Value Measurement [Member]
Financial Assets:
Limited partnership investments	19,987
ADC Arrangement classified as real estate investment	6,204	2,835
Financial Liabilities:
Total long-term debt	134,441	136,322
Portion at Other than Fair Value Measurement [Member] | Senior Notes [Member]
Financial Liabilities:
Total long-term debt	41,828	42,955
Portion at Other than Fair Value Measurement [Member] | Convertible Senior Notes [Member]
Financial Liabilities:
Total long-term debt	92,613	93,367
Portion at Other than Fair Value Measurement [Member] | (Level 2) [Member]
Financial Liabilities:
Total long-term debt	41,828	42,955
Portion at Other than Fair Value Measurement [Member] | (Level 2) [Member] | Senior Notes [Member]
Financial Liabilities:
Total long-term debt	41,828	42,955
Portion at Other than Fair Value Measurement [Member] | (Level 3) [Member]
Financial Assets:
Limited partnership investments	19,987
ADC Arrangement classified as real estate investment	6,204	2,835
Financial Liabilities:
Total long-term debt	92,613	93,367
Portion at Other than Fair Value Measurement [Member] | (Level 3) [Member] | Convertible Senior Notes [Member]
Financial Liabilities:
Total long-term debt	$ 92,613	$ 93,367

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Disclosure fair value of financial assets.

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Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

+ 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 210.9-03.7(a))



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



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 944



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.7-03.1(c))



-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 3



-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5066-111524

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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