v3.8.0.1
Income Taxes - Reconciles of Income Tax Expense to the U.S. Federal Statutory Rate (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Tax Disclosure [Abstract]    
Statutory tax at 21% and 35%, respectively $ (1,902) $ (724)
State taxes, net of federal impact 162 41
Share-based compensation tax shortfall 70 290
Nondeductible compensation 57  
Other differences 3 3
Write-off of deferred tax assets   139,090
Income tax (benefit) provision $ (1,610) $ 138,700