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Goodwill and Intangible Assets - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Indefinite Lived Intangible Assets By Major Class [Line Items]
Goodwill and intangible assets, net	$ 29,057us-gaap_IntangibleAssetsNetIncludingGoodwill	$ 28,518us-gaap_IntangibleAssetsNetIncludingGoodwill	$ 14,047us-gaap_IntangibleAssetsNetIncludingGoodwill	$ 5,201us-gaap_IntangibleAssetsNetIncludingGoodwill
Goodwill and intangible asset impairment	0us-gaap_GoodwillAndIntangibleAssetImpairment
Finite lived intangible assets, Amortization period	10 years
Corporate Operating Segment
Indefinite Lived Intangible Assets By Major Class [Line Items]
Goodwill and intangible assets, net	$ 0us-gaap_IntangibleAssetsNetIncludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

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

X

- Definition

Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

+ References

No definition available.

+ Details

Name:	us-gaap_GoodwillAndIntangibleAssetImpairment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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

X

- Definition

Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: