Annual report pursuant to Section 13 and 15(d)

Acquisitions - 2013 Acquisitions (Detail)

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Acquisitions - 2013 Acquisitions (Detail)
1 Months Ended 12 Months Ended
Oct. 31, 2013
USD ($)
Mar. 31, 2013
USD ($)
Tranche
shares
Feb. 28, 2013
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Mar. 31, 2015
USD ($)
Business Acquisition [Line Items]                
Gain (loss) due to changes in contingent cash payments       $ (3,268,000) $ 173,000   $ 1,284,000  
Amortization of finite-lived intangible assets       22,000,000 20,700,000   $ 16,600,000  
Seniors for Living, Inc.                
Business Acquisition [Line Items]                
Business acquisition, purchase price     $ 2,700,000          
Business acquisition, cash paid     $ 2,300,000          
First deferred payment period     6 months          
2nd deferred payment period     12 months          
Seniors for Living, Inc. | Maximum                
Business Acquisition [Line Items]                
Additional cash payment, deferred     $ 200,000          
Deferred cash payment, fair value     400,000          
Direct acquisition costs     $ 100,000          
Seniors for Living, Inc. | Developed product technologies                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets     3 years          
Seniors for Living, Inc. | Customer Relationships                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets     5 years          
Rent Sentinel                
Business Acquisition [Line Items]                
Business acquisition, purchase price   $ 10,500,000            
Business acquisition, cash paid   $ 7,600,000            
First deferred payment period   12 months            
2nd deferred payment period   24 months            
Direct acquisition costs               $ 100,000
Shares issued in acquisition | shares   72,500            
Rent Sentinel | Developed product technologies                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets   3 years            
Rent Sentinel | Customer Relationships                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets   9 years            
Windsor Compliance Services                
Business Acquisition [Line Items]                
Business acquisition, purchase price $ 2,700,000              
Business acquisition, cash paid 1,300,000              
Additional cash payment, deferred 1,000,000              
Additional cash payment, 2nd deferred payment $ 500,000              
First deferred payment period 12 months              
2nd deferred payment period 24 months              
Contingent cash payment $ 1,400,000              
Direct acquisition costs 100,000              
Gain (loss) due to changes in contingent cash payments $ 1,200,000              
Windsor Compliance Services | Customer Relationships                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets 10 years              
MyBuilding Inc.                
Business Acquisition [Line Items]                
Business acquisition, purchase price $ 6,900,000              
Business acquisition, cash paid 5,200,000              
Additional cash payment, deferred $ 1,500,000              
Length of time after acquisition date of deferred cash payment to be made 2 years              
Additional cash payment, 2nd deferred payment $ 1,100,000              
Deferred cash payment, fair value 1,400,000              
Contingent cash payment 300,000              
Direct acquisition costs $ 100,000              
MyBuilding Inc. | Developed product technologies                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets 3 years              
MyBuilding Inc. | Customer Relationships                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets 10 years              
Active Building LLC                
Business Acquisition [Line Items]                
Business acquisition, purchase price $ 14,400,000              
Business acquisition, cash paid 11,300,000              
Additional cash payment, deferred $ 2,000,000              
Length of time after acquisition date of deferred cash payment to be made 3 years              
Additional cash payment, 2nd deferred payment $ 6,500,000              
Deferred cash payment, fair value 1,700,000              
Contingent cash payment 1,400,000              
Direct acquisition costs $ 100,000              
Active Building LLC | Developed product technologies                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets 3 years              
Active Building LLC | Customer Relationships                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets 10 years              
2013 Acquisitions                
Business Acquisition [Line Items]                
Aggregate deferred cash obligation       1,000,000 2,400,000      
Paid deferred cash obligations       1,400,000 2,600,000 $ 0    
Liability for the estimated cash payment       0 1,800,000      
Gain (loss) due to changes in contingent cash payments       1,100,000 300,000 $ 0    
Paid contingent cash obligations       700,000        
Acquisition-related Costs | Acquired Intangible Assets                
Business Acquisition [Line Items]                
Amortization of finite-lived intangible assets       $ 2,500,000 $ 6,500,000      
Common Stock Issuable | Rent Sentinel                
Business Acquisition [Line Items]                
Shares issued in acquisition | shares   36,250            
Number of tranches | Tranche   2            
Common Stock | Rent Sentinel                
Business Acquisition [Line Items]                
Fair value of common stock issued at acquisition   $ 1,500,000            
Fair value of contingent shares of common stock issued at acquisition   $ 1,400,000