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Share-Based Compensation - Schedule of Restricted Stock Units to be Settled in Cash (Detail)
shares in Thousands
3 Months Ended
Mar. 31, 2019
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Beginning balance of Outstanding, Restricted Stock Units to be Settled in Cash 213
Restricted Stock Units to be Settled in Cash, Vested (110)
Ending balance of Outstanding, Restricted Stock Units to be Settled in Cash 103