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Series C Convertible Preferred Stock Installments (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Class of Stock [Line Items] |  |
Dividend, installment payments | $ 3,431 | $ 3,604
Principal, installment payments | 31,120 | 15,560
Total, installment payments | 34,551 | 19,164
Dividend, cash | 2,400 | 1,362
Principal, cash | 23,340 | 7,780
Total,cash | 25,740 | 9,142
Dividend, stock | 1,031 | 2,242
Principal, stock | 7,780 | 7,780
Total, stock | $ 8,811 | $ 10,022
Dividend, stock(shares) | 80,169 | 193,838
Principal, stock(shares) | 600,309 | 672,593
Total, stock(shares) | 680,478 | 866,431

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