Business (Details)	Dec. 31, 2013	Jan. 31, 2013
Business Acquisition [Line Items]
Ownership percentage in subsidiary		86.00%
AIA Purchase Agreement
Business Acquisition [Line Items]
Ownership percentage in subsidiary	94.00%	86.00%

Percentage of voting equity interests acquired at the acquisition date in the business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

Name:	us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant