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General - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Segment
Dec. 31, 2013
Dec. 31, 2012
Schedule Of Accounting Policies [Line Items]      
Number of reportable segments 1us-gaap_NumberOfReportableSegments    
Expected life of customer relationship period 2 years    
Advertising costs $ 23,000us-gaap_AdvertisingExpense $ 61,000us-gaap_AdvertisingExpense $ 150,000us-gaap_AdvertisingExpense
Subscriber Relationships [Member] | Maximum [Member]      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives of intangible assets 9 years    
Subscriber Relationships [Member] | Minimum [Member]      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives of intangible assets 3 years    
Non-competition Agreements [Member] | Maximum [Member]      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives of intangible assets 5 years    
Non-competition Agreements [Member] | Minimum [Member]      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives of intangible assets 2 years    
Technology and Other [Member]      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives of intangible assets 2 years 6 months    
Computer Equipment and Purchased Software [Member] | Maximum [Member]      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives of property and equipment 3 years    
Computer Equipment and Purchased Software [Member] | Minimum [Member]      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives of property and equipment 2 years    
Office Equipment and Furniture [Member] | Maximum [Member]      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives of property and equipment 7 years    
Office Equipment and Furniture [Member] | Minimum [Member]      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives of property and equipment 5 years