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Significant Accounting Policies - Cash and Cash Equivalents (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Cash and Cash Equivalents [Line Items]
Cash	$ 6,936	$ 4,560
Money Market Funds	173,921	342,832
Cash and cash equivalents	180,857	347,392	356,325	229,685
Cash and cash Equivalents, % by Institution	100.00%	100.00%
U .S. Bank IT&C [Member]
Cash and Cash Equivalents [Line Items]
Money Market Funds		40,463
Cash and cash equivalents		40,463
Cash and cash Equivalents, % by Institution	0.00%	11.60%
Sun Trust Bank [Member]
Cash and Cash Equivalents [Line Items]
Cash	3,093	773
Money Market Funds	5,099	1,055
Cash and cash equivalents	8,192	1,828
Cash and cash Equivalents, % by Institution	4.50%	0.50%
Sun Trust Bank Escrow Services [Member]
Cash and Cash Equivalents [Line Items]
Money Market Funds	69,548	300,843
Cash and cash equivalents	69,548	300,843
Cash and cash Equivalents, % by Institution	38.50%	86.60%
Wells Fargo Bank N.A. [Member]
Cash and Cash Equivalents [Line Items]
Cash	3,088	1,991
Money Market Funds		3
Cash and cash equivalents	3,088	1,994
Cash and cash Equivalents, % by Institution	1.70%	0.60%
Deutsche Bank Securities, Inc. [Member]
Cash and Cash Equivalents [Line Items]
Cash		1,796
Money Market Funds	37,692	468
Cash and cash equivalents	37,692	2,264
Cash and cash Equivalents, % by Institution	20.80%	0.70%
State Street Bank and Trust Company [Member]
Cash and Cash Equivalents [Line Items]
Money Market Funds	61,582
Cash and cash equivalents	61,582
Cash and cash Equivalents, % by Institution	34.10%
All Other Banking Institutions [Member]
Cash and Cash Equivalents [Line Items]
Cash	755
Cash and cash equivalents	$ 755
Cash and cash Equivalents, % by Institution	0.40%

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)

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

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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

-Subparagraph (SX 210.5-02.1)

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



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585

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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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- Definition

Cash and cash equivalents percentage by institution.

+ References

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