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Selected Quarterly Financial Information (Unaudited) (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                      
General and administrative expense $ 4,720 $ 4,835 $ 6,715 $ 5,374 $ 4,792 $ 4,790 $ 5,148 $ 4,743 $ 21,644 $ 19,473 $ 21,168
Operating loss (4,720) (4,835) (6,715) (5,374) (4,792) (4,790) (5,148) (4,743) (21,644) (19,473) (21,168)
Other income (loss), net 6,574 (4,224) (2,724) 757 1,344 91 4,819 3,084 383 9,338 (6,145)
Interest income 550 572 790 734 736 696 595 899 2,646 2,926 1,424
Interest expense (1,083) (1,077) (1,074) (1,069) (1,267) (1,461) (1,456) (1,452) (4,303) (5,636) (5,971)
Equity income (loss) 22,646 (9,866) (18,400) (6,987) (6,829) (3,293) (8,947) (7,448) (12,607) (26,517) 142,457
Net income (loss) before income taxes 23,967 (19,430) (28,123) (11,939) (10,808) (8,757) (10,137) (9,660) (35,525) (39,362) 110,597
Income tax benefit (expense) 0 0 0 0 0 0 0 0 0 0 0
Net income (loss) $ 23,967 $ (19,430) $ (28,123) $ (11,939) $ (10,808) $ (8,757) $ (10,137) $ (9,660) $ (35,525) $ (39,362) $ 110,597
Net loss per share                      
Basic (in dollars per share) $ 1.10 [1] $ (0.90) [1] $ (1.33) [1] $ (0.57) [1] $ (0.51) [1] $ (0.42) [1] $ (0.48) [1] $ (0.46) [1] $ (1.66) $ (1.88) $ 5.33
Diluted (in dollars per share) $ 0.99 [1] $ (0.90) [1] $ (1.33) [1] $ (0.57) [1] $ (0.51) [1] $ (0.42) [1] $ (0.48) [1] $ (0.46) [1] $ (1.66) $ (1.88) $ 4.74
[1] Per share amounts for the quarters have each been calculated separately. Accordingly, quarterly amounts may not add to the annual amounts because of differences in the average common shares outstanding during each period. Additionally, in regard to diluted per share amounts only, quarterly amounts may not add to the annual amounts because of the inclusion of the effect of potentially dilutive securities only in the periods in which such effect would have been dilutive, and because of the adjustments to net income (loss) for the dilutive effect of partner company common stock equivalents and convertible securities.