Income Taxes - Summary of State NOL Carryforwards Expiration Year (Detail) - State $ in Thousands	Dec. 31, 2016 USD ($)
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 83,027
2017
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	6,930
2018
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	1,132
2019
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	7,646
2020
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	2,121
2021
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	4,050
Thereafter
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 61,148