Quarterly report pursuant to Section 13 or 15(d)

Summary of Potential Number of Shares Vesting under Restricted Stock Unit Awards (Detail)

v3.19.3
Summary of Potential Number of Shares Vesting under Restricted Stock Unit Awards (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
shares
Disclosure Of Restricted Stock Unit [Abstract]  
Number of shares vesting at IRR of at least 6% | shares 136,285
Number of shares vesting at IRR of at least 8% | shares 204,427
Number of shares vesting at IRR of at least 14% | shares 306,651
Value at grant at IRR of at least 6% | $ $ 5,011
Value at grant at IRR of at least 8% | $ 7,517
Value at grant at IRR of at least 14% | $ $ 11,276