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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
	Mar. 31, 2015	Mar. 31, 2014
Property, Plant and Equipment [Line Items]
Total depreciation and amortization expense	$ 4,987us-gaap_DepreciationDepletionAndAmortization	$ 4,700us-gaap_DepreciationDepletionAndAmortization
Operating Expenses [Member]
Property, Plant and Equipment [Line Items]
Total depreciation and amortization expense	4,891us-gaap_DepreciationDepletionAndAmortization / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember	4,584us-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	$ 96us-gaap_DepreciationDepletionAndAmortization / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	$ 116us-gaap_DepreciationDepletionAndAmortization / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember

X

- 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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Balance Type:	debit
Period Type:	duration

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- Details

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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Period Type: