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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 | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Property, Plant and Equipment [Line Items] |  |  |  |
Total depreciation and amortization expense | $ 5,188 | $ 4,770 | $ 15,000 | $ 14,144
Operating expenses [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Total depreciation and amortization expense | 5,087 | 4,686 | 14,666 | 13,911
Corporate general and administrative expenses [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Total depreciation and amortization expense | $ 101 | $ 84 | $ 334 | $ 233

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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