Subsequent Event - Acquisition of Republic Project (Details) (Subsequent event, Republic Project, USD $) In Millions, unless otherwise specified	Oct. 04, 2013
Subsequent Event - Acquisition of Republic Project
Cash paid for acquisition	$ 1.4
Minimum
Subsequent Event - Acquisition of Republic Project
Additional earn out based on reaching revenue and adjusted EBITDA performance targets in 2014 and 2015	0
Maximum
Subsequent Event - Acquisition of Republic Project
Additional earn out based on reaching revenue and adjusted EBITDA performance targets in 2014 and 2015	$ 13.1

Amount of cash paid to acquire the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph f(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant