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%