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Cash and Cash Equivalents, Including Restricted Cash - Schedule of Cash and Cash Equivalents, Including Restricted Cash Balances (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Credit Rating [Line Items]
Cash and cash equivalents	$ 10,283	$ 15,423	$ 38,867	$ 34,818
Restricted cash	76,396	14,246
Total	86,679	29,669
Bank of America [Member] \| A-1 Credit Rating [Member]
Credit Rating [Line Items]
Cash and cash equivalents	10,283	15,423
Restricted cash	$ 76,396	$ 14,246

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.

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