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Property and Equipment, Net - Summary of Depreciation Expense Related to Property and Equipment (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] |  |  |
Total depreciation expense | $ 5,353 us-gaap_Depreciation | $ 4,756 us-gaap_Depreciation | $ 4,688 us-gaap_Depreciation
Operating Expenses [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total depreciation expense | 4,940 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember | 4,425 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember | 4,381 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember
Corporate General and Administrative Expenses [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total depreciation expense | $ 413 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | $ 331 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | $ 307 us-gaap_Depreciation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember

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

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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