Partnership's Average Interest Rate and Average Debt Balance (Detail) (USD $) In Thousands, unless otherwise specified						9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Revolving Credit Facility	Dec. 31, 2013 Revolving Credit Facility	Sep. 30, 2014 Revolving Credit Facility Weighted Average	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 5.875 Percent Senior Notes due April 2021 Weighted Average	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 6.125 Percent Senior Notes due July 2022 Weighted Average	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 May 2023 Weighted Average	Sep. 30, 2014 4.875 Percent Senior Notes due March 2024	Mar. 07, 2014 4.875 Percent Senior Notes due March 2024	Dec. 31, 2013 4.875 Percent Senior Notes due March 2024	Sep. 30, 2014 4.875 Percent Senior Notes due March 2024 Weighted Average
Debt Instrument [Line Items]
Average Interest Rate					2.182%	5.875%	5.875%	5.875%	5.875%	5.875%	6.125%	6.125%	6.125%	6.125%	4.875%	4.875%	4.875%	4.875%	4.875%	4.875%	4.875%	4.875%
Average Balance	$ 4,120,728	$ 3,249,230	$ 465,500	$ 343,500	$ 371,647	$ 750,000	$ 750,000			$ 750,000	$ 750,000	$ 750,000		$ 750,000	$ 1,400,000	$ 1,400,000		$ 1,400,000	$ 750,000			$ 750,000
Premium on long-term debt, Average Interest Rate						5.875%
Premium on long-term debt, Average Balance						$ 5,479