Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation Plans - 2013 Omnibus Equity Incentive Plan - Additional Information (Detail)

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Stock-Based Compensation Plans - 2013 Omnibus Equity Incentive Plan - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended
Nov. 30, 2013
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vested shares   239,396
Number of common stock shares withheld to pay employee statutory withholding taxes   41,293
Windfall tax benefits net from stock-based award activity included in additional paid-in capital   $ 157,000
Restricted Stock Awards [Member] | Non-Employee Directors [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years 3 years
Vested shares   10,998
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period   5 years
Deferred stock units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fully vested deferred stock units remaining outstanding   1,365,445