Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Plans - Pre-IPO - Additional Information (Detail)

v3.3.1.900
Stock-Based Compensation Plans - Pre-IPO - Additional Information (Detail) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized stock-based compensation expenses recognition period 3 years 5 months 1 day  
Pre-IPO [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of stock option redemption or cancelations   0
Unrecognized stock-based compensation expenses recognition period 4 years  
Pre-IPO [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
Pre-IPO [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 5 years  
Notes receivable from employees [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Notes issued, interest rate 5.00%  
Notes issued, interest rate 6.00%  
Notes issued, payment date Apr. 15, 2016  
Restricted Common Stock [Member] | Pre-IPO [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Terms of Issued Options One year or less