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Long-Term Debt (Narrative) (Detail) (USD $)
0 Months Ended
Feb. 26, 2015
Mar. 31, 2015
Dec. 31, 2014
Long Term Debt Other Disclosures [Abstract]      
Weighted average interest rate   8.40%us-gaap_DebtWeightedAverageInterestRate 8.10%us-gaap_DebtWeightedAverageInterestRate
Market value   $ 20,000,000,000us-gaap_DebtInstrumentFairValue $ 19,700,000,000us-gaap_DebtInstrumentFairValue
Term Loan B [Member]      
Long Term Debt Other Disclosures [Abstract]      
Early Repayment of Senior Debt 916,100,000us-gaap_EarlyRepaymentOfSeniorDebt
/ us-gaap_DebtInstrumentAxis
= cik0001400891_TermLoanBMember
   
Term Loan C [Member]      
Long Term Debt Other Disclosures [Abstract]      
Early Repayment of Senior Debt $ 15,200,000us-gaap_EarlyRepaymentOfSeniorDebt
/ us-gaap_DebtInstrumentAxis
= cik0001400891_TermLoanCMember