Business (Details)	Mar. 31, 2014 Number properties
Business [Line Items]
Number of properties in diversified portfolio	1,145
Number of states in diversified portfolio	46
Controlling [Member]
Business [Line Items]
Number of properties in diversified portfolio	1,212

The number of states the entity operates in as of the balance sheet date.

No definition available.

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant