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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 | $ 29,057 us-gaap_IntangibleAssetsNetIncludingGoodwill | $ 28,518 us-gaap_IntangibleAssetsNetIncludingGoodwill | $ 14,047 us-gaap_IntangibleAssetsNetIncludingGoodwill | $ 5,201 us-gaap_IntangibleAssetsNetIncludingGoodwill
Goodwill and intangible asset impairment | 0 us-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 | $ 0 us-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: |