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Depreciation and Amortization - Depreciation and Amortization Expense for Property and Equipment and Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Property, Plant and Equipment [Line Items] |  |
Total depreciation and amortization expense | $ 4,987 us-gaap_DepreciationDepletionAndAmortization | $ 4,700 us-gaap_DepreciationDepletionAndAmortization
Operating Expenses [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Total depreciation and amortization expense | 4,891 us-gaap_DepreciationDepletionAndAmortization / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember | 4,584 us-gaap_DepreciationDepletionAndAmortization / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember
Corporate General and Administrative Expenses [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Total depreciation and amortization expense | $ 96 us-gaap_DepreciationDepletionAndAmortization / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | $ 116 us-gaap_DepreciationDepletionAndAmortization / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + 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
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_GeneralAndAdministrativeExpenseMember
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: |