Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill impairment	$ 0us-gaap_GoodwillImpairmentLoss	$ 0us-gaap_GoodwillImpairmentLoss	$ 0us-gaap_GoodwillImpairmentLoss
Amortization expense on intangible assets	2,837,000us-gaap_AmortizationOfIntangibleAssets	3,057,000us-gaap_AmortizationOfIntangibleAssets	3,082,000us-gaap_AmortizationOfIntangibleAssets
Intangibles on business combination	7,111,000	1,332,000
2014 Acquisitions [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Increase in gross carrying amount of intangibles	7,033,000	645,000
Continuing Operations [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible asset impairment	$ 0	$ 0	$ 352,000

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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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

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- Definition

Amount of increase (decrease) in carrying value of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

No definition available.

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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.

+ References

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

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