Earnings Per OP Unit of MAALP Statement (details) - Limited Partner [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2016	Sep. 30, 2015	Mar. 31, 2015
Earnings Per Share Disclosure [Line Items]
Weighted average common units - basic		75,249		79,336
Effect of dilutive securities	[1]	240		0
Weighted average common shares - diluted		75,489		79,336
Calculation of Basic Earnings Per Unit [Member]
Earnings Per Share Disclosure [Line Items]
Income from continuing operations		$ 45,808		$ 64,677
Income from continuing operations allocated to unvested restricted shares		(110)		(131)
Income from continuing operations available for common unitholders, adjusted		$ 45,698		$ 64,546
Earnings per unit - basic		$ 0.61		$ 0.81
Calculation of Diluted Earnings Per Unit [Member]
Earnings Per Share Disclosure [Line Items]
Income from continuing operations		$ 45,808		$ 64,677
Income from continuing operations allocated to unvested restricted shares	[1]	0		(131)
Income from continuing operations available for common unitholders, adjusted		$ 45,808		$ 64,546
Earnings per unit - diluted		$ 0.61		$ 0.81
Restricted Stock [Member]
Earnings Per Share Disclosure [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			200

[1] (1) For three months ended March 31, 2015, 0.2 million potentially dilutive securities and their related income are not included in the diluted earnings per share calculations as they are not dilutive.