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Fair Value Measurements - Carrying Amounts, Estimated Fair Values and Valuation Input Levels of the Company's Senior Notes, Senior Secured Term Loans and Senior Secured Revolving Credit Facility (Detail) (USD $)
In Thousands, unless otherwise specified
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Mar. 31, 2015
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Dec. 31, 2014
|
| Hydrogenics [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Available-for-sale securities |
$ 15,427 |
$ 20,392 |
| Prepaid Expenses and Other Current Assets [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Foreign currency contracts |
2,323 |
1,165 |
| Other Accrued Liabilities [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
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| Foreign currency contracts |
2,575 |
3,584 |
| 5.00% Senior Notes Due 2021 [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Senior notes |
650,000 |
650,000 |
| 5.50% Senior Notes Due 2024 [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Senior notes |
650,000 |
650,000 |
| Senior Secured Term Loans Due 2017, at Par [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Senior secured term loans |
344,750 |
345,625 |
| Senior Secured Term Loans Due 2018, at Par [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Senior secured term loans |
517,125 |
518,438 |
| Senior PIK Toggle Notes Due 2020 [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Senior PIK toggle notes due 2020 |
550,000 |
550,000 |
| Fair Value [Member] | Level 1 [Member] | Hydrogenics [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Available-for-sale securities |
15,427 |
20,392 |
| Fair Value [Member] | Level 2 [Member] | Prepaid Expenses and Other Current Assets [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Foreign currency contracts |
2,323 |
1,165 |
| Fair Value [Member] | Level 2 [Member] | Other Accrued Liabilities [Member] |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Foreign currency contracts |
2,575 |
3,584 |
| Fair Value [Member] | Level 2 [Member] | 5.00% Senior Notes Due 2021 [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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|
| Senior notes |
649,220 |
643,500 |
| Fair Value [Member] | Level 2 [Member] | 5.50% Senior Notes Due 2024 [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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|
| Senior notes |
649,220 |
640,250 |
| Fair Value [Member] | Level 2 [Member] | Senior Secured Term Loans Due 2017, at Par [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Senior secured term loans |
344,535 |
342,169 |
| Fair Value [Member] | Level 2 [Member] | Senior Secured Term Loans Due 2018, at Par [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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|
| Senior secured term loans |
517,435 |
513,254 |
| Fair Value [Member] | Level 2 [Member] | Senior PIK Toggle Notes Due 2020 [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Senior PIK toggle notes due 2020 |
$ 565,125 |
$ 566,500 |