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Significant Accounting Policies - Cash and Cash Equivalents (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash and Cash Equivalents [Line Items]
Cash	$ 4,562	$ 4,560
Money Market Funds	112,713	342,832
Cash and cash equivalents	117,275	347,392	229,685	133,645
Cash and cash equivalents, % by Institution	100.00%	100.00%
U.S. Bank IT&C [Member]
Cash and Cash Equivalents [Line Items]
Cash
Money Market Funds		40,463
Cash and cash equivalents		40,463
Cash and cash equivalents, % by Institution		11.60%
Sun Trust Bank [Member]
Cash and Cash Equivalents [Line Items]
Cash	931	773
Money Market Funds	3,550	1,055
Cash and cash equivalents	4,481	1,828
Cash and cash equivalents, % by Institution	3.80%	0.50%
Sun Trust Bank Escrow Services [Member]
Cash and Cash Equivalents [Line Items]
Cash
Money Market Funds	56,129	300,843
Cash and cash equivalents	56,129	300,843
Cash and cash equivalents, % by Institution	47.90%	86.60%
Wells Fargo Bank N.A. [Member]
Cash and Cash Equivalents [Line Items]
Cash	3,631	1,991
Money Market Funds		3
Cash and cash equivalents	3,631	1,994
Cash and cash equivalents, % by Institution	3.10%	0.60%
Deutsche Bank Securities, Inc. [Member]
Cash and Cash Equivalents [Line Items]
Cash
Money Market Funds	33,041
Cash and cash equivalents	33,041
Cash and cash equivalents, % by Institution	28.20%
State Street Bank and Trust Company [Member]
Cash and Cash Equivalents [Line Items]
Cash
Money Market Funds	19,993
Cash and cash equivalents	19,993
Cash and cash equivalents, % by Institution	17.00%
All Other Banking Institutions [Member]
Cash and Cash Equivalents [Line Items]
Cash		1,796
Money Market Funds		468
Cash and cash equivalents		$ 2,264
Cash and cash equivalents, % by Institution		0.70%

X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

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X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 1

-Subparagraph (a)

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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Cash and cash equivalents percentage by institution.

+ References

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