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Property and Equipment - Summary of Depreciation Expense (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | $ 6,500 us-gaap_Depreciation | $ 5,112 us-gaap_Depreciation | $ 3,994 us-gaap_Depreciation
Cost of revenues [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | 5,652 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 4,317 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 3,271 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
General and administrative expenses [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | 715 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | 690 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | 594 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember
Sales and marketing expenses [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | $ 133 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember | $ 105 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember | $ 129 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_Depreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_SellingAndMarketingExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |