Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Summary of Activity (Detail)

v3.10.0.1
Share-Based Compensation - Summary of Activity (Detail) - 2009 Long-Term Incentive Plan [Member]
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding at January 1, 2018 1,436,348
Option grants 7,257
Exercised options (45,800)
Cancelled or forfeited options (32,000)
Outstanding at December 31, 2018 1,584,225
Exercisable options at December 31, 2018 274,540
Weighted Average Exercise Price  
Outstanding at January 1, 2018 | $ / shares $ 7.67
Option grants | $ / shares 14.95
Exercised options | $ / shares 5.86
Cancelled or forfeited options | $ / shares 7.36
Outstanding at December 31, 2018 | $ / shares 7.97
Exercisable options at December 31, 2018 | $ / shares $ 7.30
Weighted Average Remaining Contractual Life (in years)  
Outstanding at December 31, 2018 4 years 4 months 24 days
Exercisable options at December 31, 2018 6 years 4 months 24 days
Aggregate Intrinsic Value  
Outstanding at December 31, 2018 | $ $ 12,563,473
Exercisable options at December 31, 2018 | $ $ 853,670
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted stock unit grants 316,661
Cancelled or forfeited restricted stock units (98,241)