|
Supplemental Financial Statement Information - Summary of Information Related to Sale of Shares (Detail) (Hydrogenics [Member], USD $)
In Thousands, except Share data, unless otherwise specified |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
|
|
Hydrogenics [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Shares sold | 172,000 | 0 |
| Proceeds received | $ 2,493 | $ 0 |
| Pretax gain realized | $ 2,363 | $ 0 |