|
Contract Costs - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2012
|
Sep. 30, 2011
|
Sep. 30, 2012
Project
|
Sep. 30, 2011
Project
|
|
| Long-term Contracts or Programs Disclosure [Line Items] | ||||
| Percentage of pass-through costs included in revenue | 58.20% | 46.90% | 46.00% | 46.60% |
| Total revenue recorded in relation to orders change in projects | $ 1.7 | $ 1.7 | ||
| Number of projects orders changed | 2 | 2 | ||
| Total revenue recorded in relation to re-measure units and quantities within customer construction contract | 6.6 | |||
| Recognized contract losses from uncompleted contracts | (20.6) | (1.8) | (21.2) | (2.4) |
| Unfavorable reduction in gross margin due to contract loss from uncompleted contracts | $ 26.8 | $ 1.8 | $ 24.5 | $ 2.4 |