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Employee Benefit Plans - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
Contribution on participant's elective deferrals 100.00% 100.00%
Discretionary contributions on behalf of participants 2.00%  
Contributions to the Plan $ 0.4 $ 0.3
Shares held 286,725 292,989
Maximum investment in incoming contributions 20.00%  
Maximum [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Maximum participant's eligible compensation 4.00% 4.00%