XML 86 R75.htm IDEA: XBRL DOCUMENT v3.19.1
Summary of Potential Number of Shares Vesting under Restricted Stock Unit Awards (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 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