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Segment Reporting - Additional Information (Detail)	Sep. 30, 2013 Segment
Segment Reporting [Abstract]
Number of reportable operating segments	2

X

- Details

Name:	us-gaap_SegmentReportingAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of reportable operating segment.

+ References

No definition available.

+ Details

Name:	usmo_NumberOfReportableOperatingSegment
Namespace Prefix:	usmo_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant