Quarterly Financial Data (Unaudited) - Quarterly Financial Data (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 |
|
| Quarterly Financial Information Disclosure [Abstract] | |||||||||||
| Contract revenue | $ 217,660 | $ 222,191 | $ 218,789 | $ 250,354 | $ 344,953 | $ 448,134 | $ 423,154 | $ 378,129 | $ 908,994 | $ 1,594,370 | $ 1,495,125 |
| Contract income | 7,990 | 13,336 | 11,578 | 7,850 | 18,612 | 38,631 | 21,448 | 18,061 | 40,754 | 96,752 | |
| Operating income (loss) | (5,408) | (12,367) | (13,038) | (21,285) | (15,437) | 3,175 | (6,307) | (9,878) | (52,098) | (28,447) | 2,836 |
| Income (loss) from continuing operations before income taxes | (13,658) | (19,454) | (19,920) | (65,548) | (37,282) | (4,643) | (14,889) | (17,565) | (118,580) | (74,379) | (40,690) |
| Loss from continuing operations | 19,209 | (19,411) | (19,403) | (44,944) | (42,439) | 15,305 | (5,058) | (42,416) | (64,549) | (74,608) | (36,698) |
| Income (loss) from discontinued operations, net of provision for income taxes | 58,183 | 2,212 | 517 | 35,120 | 6,472 | (18,664) | (10,453) | 17,426 | 96,032 | (5,219) | 20,831 |
| Net loss | $ 77,392 | $ (17,199) | $ (18,886) | $ (9,824) | $ (35,967) | $ (3,359) | $ (15,511) | $ (24,990) | $ 31,483 | $ (79,827) | $ (15,867) |
| Basic income (loss) per share attributable to Company shareholders: | |||||||||||
| Loss from continuing operations (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) |
| Income (loss) from discontinued operations (in dollar per share) | 0.96 | 0.03 | 0.01 | 0.70 | 0.14 | (0.38) | (0.21) | 0.36 | 1.66 | (0.11) | 0.44 |
| Net income (loss) (in dollar per share) | 1.28 | (0.29) | (0.32) | (0.20) | (0.72) | (0.07) | (0.32) | (0.51) | 0.54 | (1.62) | (0.32) |
| Diluted income (loss) per share attributable to Company shareholders: | |||||||||||
| Loss from continuing operations (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) |
| Income (loss) from discontinued operations (in dollar per share) | 0.95 | 0.03 | 0.01 | 0.70 | 0.14 | (0.37) | (0.21) | 0.36 | 1.66 | (0.11) | 0.44 |
| Net income (loss) (in dollar per share) | $ 1.26 | $ (0.29) | $ (0.32) | $ (0.20) | $ (0.72) | $ (0.07) | $ (0.32) | $ (0.51) | $ 0.54 | $ (1.62) | $ (0.32) |
| Weighted average number of common shares outstanding | |||||||||||
| Basic (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 |
| Diluted (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 |