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Significant accounting policies - Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2013
Trade names | Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful life	5 years
Trade names | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful life	10 years
Non-competition agreements | Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful life	3 years
Non-competition agreements | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful life	5 years
Capitalized computer software and development costs | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful life	4 years
Patents | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, useful life	6 years

X

- Details

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

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration