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Market Concentrations and Risks - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Concentration Risk [Line Items] |  |  |
Number of customers | 10 |  |
Number of Distributers | 6 |  |
Carrying amount of debt instruments | $ 1,367,036,000 | $ 1,151,205,000 |
Fair value of debt instrument | 1,098,600,000 | 725,200,000 |
Face value of senior subordinated notes | 1,118,300,000 | 705,200,000 |
Copper [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Committed amounts to purchase | 1,600,000 |  |
Aggregate cost | 5,400,000 |  |
Recorded unconditional purchase obligation fixed cost | 200,000 |  |
Aluminum [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Committed amounts to purchase | 400,000 |  |
Aggregate cost | $ 300,000 |  |
Workforce subject to collective bargaining arrangements [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 23.00% |  |
Workforce subject to collective bargaining arrangements expiring within one year [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 21.00% |  |
Customer Concentration Risk [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 36.00% | 34.00% | 34.00%

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