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Organization and Summary of Significant Accounting Policies - Additional Information (Detail)
shares in Millions
12 Months Ended
Dec. 31, 2015
Subsidiary
shares
Dec. 31, 2014
shares
Dec. 31, 2013
shares
Organization And Summary Of Significant Accounting Policies [Line Items]      
Number of subsidiary wholly-owned by company | Subsidiary 2    
Common share equivalents excluded from computation of earnings per share 4.1 2.9 2.1
Stock Options      
Organization And Summary Of Significant Accounting Policies [Line Items]      
Common share equivalents excluded from computation of earnings per share 0.1 1.0 0.3
Minimum      
Organization And Summary Of Significant Accounting Policies [Line Items]      
Average estimated useful life of equipment 3 years    
Requisite service period of award 3 years    
Maximum      
Organization And Summary Of Significant Accounting Policies [Line Items]      
Average estimated useful life of equipment 7 years    
Requisite service period of award 4 years