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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Intangible Assets [Line Items]
Goodwill impairment		$ 0us-gaap_GoodwillImpairmentLoss	$ 0us-gaap_GoodwillImpairmentLoss
Goodwill accumulated impairment loss		0
Impairment of trade name	2,904,000		2,904,000
Intangible assets, Amortization expense		$ 1,300,000us-gaap_AmortizationOfIntangibleAssets	$ 1,400,000us-gaap_AmortizationOfIntangibleAssets	$ 1,600,000us-gaap_AmortizationOfIntangibleAssets
Hub [Member] \| Weighted Average [Member]
Intangible Assets [Line Items]
Weighted average life of definite lived intangible assets		5 years 5 months 1 day
Mode [Member] \| Weighted Average [Member]
Intangible Assets [Line Items]
Weighted average life of definite lived intangible assets		14 years 3 months