Income (Loss) Per Share - Schedule of Basic and Diluted Income (Loss) Per Common Share from Continuing Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Jun. 30, 2014 |
Mar. 31, 2014 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Earnings Per Share [Abstract] | |||||||||||
| Net loss from continuing operations applicable to common shares (numerator for basic and diluted calculation) | $ 19,209 | $ (19,411) | $ (19,403) | $ (44,944) | $ (42,439) | $ 15,305 | $ (5,058) | $ (42,416) | $ (64,549) | $ (74,608) | $ (36,698) |
| Weighted average number of common shares outstanding for basic income per share (in shares) | 60,510,199 | 60,335,717 | 60,227,495 | 49,819,388 | 49,630,085 | 49,414,847 | 49,336,581 | 48,847,349 | 57,759,988 | 49,310,044 | 48,560,167 |
| Weighted average number of potentially dilutive common shares outstanding (in shares) | 0 | 0 | 0 | ||||||||
| Weighted average number of common shares outstanding for diluted income per share (in shares) | 61,091,783 | 60,335,717 | 60,227,495 | 49,819,388 | 49,630,085 | 50,226,661 | 49,336,581 | 48,847,349 | 57,759,988 | 49,310,044 | 48,560,167 |
| Loss per common share from continuing operations: | |||||||||||
| Basic (in dollar per share) | $ 0.32 | $ (0.32) | $ (0.33) | $ (0.90) | $ (0.86) | $ 0.31 | $ (0.11) | $ (0.87) | $ (1.12) | $ (1.51) | $ (0.76) |
| Diluted (in dollar per share) | $ 0.31 | $ (0.32) | $ (0.33) | $ (0.90) | $ (0.86) | $ 0.30 | $ (0.11) | $ (0.87) | $ (1.12) | $ (1.51) | $ (0.76) |