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Description of Operations and Summary of Significant Accounting Policies - Additional Information (Detail)
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
shares
Jun. 30, 2015
shares
Jun. 30, 2016
Segment
Jun. 30, 2015
shares
Accounting Policies [Abstract]        
Number of operating segment | Segment     1  
Anti-dilutive securities excluded from computation of diluted net income per share | shares 6.6 3.8   1.8