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Redemption Price of Notes Plus Accrued and Unpaid Interest Thereon to Redemption Date (Detail) - Senior Notes [Member]
12 Months Ended
Dec. 31, 2016
5½% Senior Notes [Member] | 2017 [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Redemption Price, Percentage in Addition to Accrued and Unpaid Interest 102.75%
5½% Senior Notes [Member] | 2018 [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Redemption Price, Percentage in Addition to Accrued and Unpaid Interest 101.375%
5½% Senior Notes [Member] | 2019 and thereafter [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Redemption Price, Percentage in Addition to Accrued and Unpaid Interest 100.00%
5% Senior Notes [Member] | 2016 [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Redemption Price, Percentage in Addition to Accrued and Unpaid Interest 102.50%
5% Senior Notes [Member] | 2017 [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Redemption Price, Percentage in Addition to Accrued and Unpaid Interest 101.25%
5% Senior Notes [Member] | 2018 and thereafter [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Redemption Price, Percentage in Addition to Accrued and Unpaid Interest 100.00%