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Employee Benefit Plans - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Expenses related to employer contributions $ 1.9 $ 1.9 $ 1.8
Expenses related to deferred compensation plan 0.3 0.3 $ 0.4
Deferred compensation liability $ 21.3 $ 22.4  
Nonqualified Deferred Compensation Plan [Member]      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Percent match by employer on the first 6% of employee compensation 50.00%    
Maximum percent of compensation employer will match 3.00%