Partnership's Outstanding Debt (Parenthetical) (Detail)	9 Months Ended	12 Months Ended			9 Months Ended	12 Months Ended		9 Months Ended	12 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2014 5.875 Percent Senior Notes due April 2021	Dec. 31, 2013 5.875 Percent Senior Notes due April 2021	Aug. 14, 2013 5.875 Percent Senior Notes due April 2021	Apr. 19, 2011 5.875 Percent Senior Notes due April 2021	Sep. 30, 2014 6.125 Percent Senior Notes due July 2022	Dec. 31, 2013 6.125 Percent Senior Notes due July 2022	Jan. 11, 2012 6.125 Percent Senior Notes due July 2022	Sep. 30, 2014 4.875 Percent Senior Notes due May 2023	Dec. 31, 2013 4.875 Percent Senior Notes due May 2023	Dec. 19, 2012 4.875 Percent Senior Notes due May 2023	Sep. 30, 2014 4.875 Percent Senior Notes due March 2024	Dec. 31, 2013 4.875 Percent Senior Notes due March 2024	Mar. 07, 2014 4.875 Percent Senior Notes due March 2024
Debt Instrument [Line Items]
Debt, interest rate	5.875%	5.875%	5.875%	5.875%	6.125%	6.125%	6.125%	4.875%	4.875%	4.875%	4.875%	4.875%	4.875%
Debt, maturity date	2021-04	2021-04			2022-07	2022-07		2023-05	2023-05		2024-03	2024-03