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Accounting Policies - Additional Information (Detail)
3 Months Ended 9 Months Ended
Nov. 14, 2016
Oct. 18, 2016
$ / shares
Sep. 30, 2016
$ / shares
shares
Sep. 30, 2015
shares
Sep. 30, 2016
$ / shares
shares
Sep. 30, 2015
shares
Dec. 31, 2015
$ / shares
Schedule Of Accounting Policies [Line Items]              
Common stock, par value        
Shares, non-dilutive | shares     0 3,750 0 3,750  
Subsequent Event [Member]              
Schedule Of Accounting Policies [Line Items]              
Stock split ratio 1.5 1.5          
Common stock, par value   $ 0