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Amount after accumulated impairment loss of 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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Significant Accounting Policies (Detail Textuals 1) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Depreciation method used for property, plant and equipment	straight-line basis
Goodwill	$ 32,150,000us-gaap_Goodwill	$ 31,861,000us-gaap_Goodwill
Acquisition of assets of a business		17,044,000
Goodwill on acquisition		7,768,000us-gaap_GoodwillAcquiredDuringPeriod
Advertising expenses	$ 3,959,000us-gaap_AdvertisingExpense	$ 3,458,000us-gaap_AdvertisingExpense	$ 2,965,000us-gaap_AdvertisingExpense
Defined Benefit Pension Plan
Derivative Instruments, Gain (Loss) [Line Items]
Defined benefit pension plan eligibility criteria	Defined benefit pension plan that provides monthly benefits upon retirement at age 65 to eligible employees with at least one year of service prior to 2002.
Operating equipment \| Minimum
Derivative Instruments, Gain (Loss) [Line Items]
Estimated useful lives of the assets	3 years
Operating equipment \| Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Estimated useful lives of the assets	20 years
Buildings and leasehold improvements \| Minimum
Derivative Instruments, Gain (Loss) [Line Items]
Estimated useful lives of the assets	15 years
Buildings and leasehold improvements \| Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Estimated useful lives of the assets	39 years
Furniture and fixtures \| Minimum
Derivative Instruments, Gain (Loss) [Line Items]
Estimated useful lives of the assets	5 years
Furniture and fixtures \| Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Estimated useful lives of the assets	7 years
Software
Derivative Instruments, Gain (Loss) [Line Items]
Estimated useful lives of the assets	5 years
Vehicles \| Minimum
Derivative Instruments, Gain (Loss) [Line Items]
Estimated useful lives of the assets	3 years
Vehicles \| Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Estimated useful lives of the assets	5 years