Partnership's Outstanding Debt (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
5.875 Percent Senior Notes due April 2021
Debt Instrument [Line Items]
Debt, interest rate	5.875%	5.875%
Debt, maturity date	2021-04	2021-04
6.125 Percent Senior Notes due July 2022
Debt Instrument [Line Items]
Debt, interest rate	6.125%	6.125%
Debt, maturity date	2022-07	2022-07
4.875 Percent Senior Notes due May 2023
Debt Instrument [Line Items]
Debt, interest rate	4.875%	4.875%
Debt, maturity date	2023-05	2023-05
4.875 Percent Senior Notes due March 2024
Debt Instrument [Line Items]
Debt, interest rate	4.875%	4.875%
Debt, maturity date	2024-03	2024-03