Fair Value Measurements - Carrying Amounts, Estimated Fair Values and Valuation Input Levels of the Company's Available-for-Sale Securities, Foreign Currency Contracts and Debt Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
6.00% Senior Notes Due June 2025 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	$ 1,500,000	$ 1,500,000
5.50% Senior Notes Due 2024 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	650,000	650,000
5.00% Senior Notes Due 2021 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	650,000	650,000
Senior PIK Toggle Notes Due 2020 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior PIK toggle notes due June 2020		536,630
Senior Secured Term Loans Due 2018, at Par [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured debt	261,875	261,875
Carrying Amount [Member] | Other Assets Noncurrent [Member] | Hydrogenics [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	7,771	11,683
Carrying Amount [Member] | Prepaid Expenses and Other Current Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign currency contracts	673	1,051
Carrying Amount [Member] | Other Accrued Liabilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign currency contracts	1,398	5,945
Carrying Amount [Member] | 6.00% Senior Notes Due June 2025 [Member] | Long Term Debt Noncurrent [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	1,500,000	1,500,000
Carrying Amount [Member] | 5.50% Senior Notes Due 2024 [Member] | Long Term Debt Noncurrent [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	650,000	650,000
Carrying Amount [Member] | 5.00% Senior Notes Due 2021 [Member] | Long Term Debt Noncurrent [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	650,000	650,000
Carrying Amount [Member] | Senior PIK Toggle Notes Due 2020 [Member] | Long Term Debt Noncurrent [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior PIK toggle notes due June 2020		536,630
Carrying Amount [Member] | 4.375% Senior Secured Notes Due 2020 [ Member] | Long Term Debt Noncurrent [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured debt	500,000	500,000
Carrying Amount [Member] | Senior Secured Term Loan Due 2022, at Par [Member] | Long Term Debt Noncurrent [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured debt	1,237,500	1,246,875
Carrying Amount [Member] | Senior Secured Term Loans Due 2018, at Par [Member] | Long Term Debt Noncurrent [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured debt	261,875	261,875
Fair Value [Member] | Level 1 [Member] | Other Assets Noncurrent [Member] | Hydrogenics [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities	7,771	11,683
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	673	1,051
Fair Value [Member] | Level 2 [Member] | Other Accrued Liabilities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign currency contracts	1,398	5,945
Fair Value [Member] | Level 2 [Member] | 6.00% Senior Notes Due June 2025 [Member] | Long Term Debt Noncurrent [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	1,599,450	1,430,700
Fair Value [Member] | Level 2 [Member] | 5.50% Senior Notes Due 2024 [Member] | Long Term Debt Noncurrent [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	680,875	617,500
Fair Value [Member] | Level 2 [Member] | 5.00% Senior Notes Due 2021 [Member] | Long Term Debt Noncurrent [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	672,750	619,125
Fair Value [Member] | Level 2 [Member] | Senior PIK Toggle Notes Due 2020 [Member] | Long Term Debt Noncurrent [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior PIK toggle notes due 2020		544,679
Fair Value [Member] | Level 2 [Member] | 4.375% Senior Secured Notes Due 2020 [ Member] | Long Term Debt Noncurrent [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes	516,250	500,000
Fair Value [Member] | Level 2 [Member] | Senior Secured Term Loan Due 2022, at Par [Member] | Long Term Debt Noncurrent [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured term loans	1,252,969	1,243,727
Fair Value [Member] | Level 2 [Member] | Senior Secured Term Loans Due 2018, at Par [Member] | Long Term Debt Noncurrent [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior secured term loans	$ 263,021	$ 260,068