Other Items - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | ||
---|---|---|---|
Mar. 31, 2014
|
Mar. 31, 2015
|
Dec. 31, 2014
|
|
Asset Retirement Obligation [Line Items] | |||
Development project charges | $ 1,440 | ||
Deferred project costs | 0 | 0 | |
Gain on settlement of acquisition related contingent consideration | (1,058) | ||
Industrial Service Management Business [Member] | |||
Asset Retirement Obligation [Line Items] | |||
Gain on settlement of acquisition related contingent consideration | 1,058 | ||
Maine Energy Facility [Member] | |||
Asset Retirement Obligation [Line Items] | |||
Development project charges | $ 1,440 |