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 | ||
|