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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
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Credit Rating [Line Items]        
Cash $ 59,746 $ 15,423 $ 34,604 $ 34,818
Restricted cash 21,972 14,246    
Total 81,718 29,669    
Bank of America [Member] | A-1 Credit Rating [Member]
       
Credit Rating [Line Items]        
Cash 59,746 15,423    
Restricted cash $ 21,972 $ 14,246