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Share-Based Compensation - Summary of Time-vesting Restricted Shares and Performance-vesting Restricted Shares (Detail)
shares in Thousands
6 Months Ended
Jun. 30, 2018
$ / shares
shares
Time Vesting Restricted Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Issued | shares 1,376
Vested | shares 970
Expected to vest at June 30, 2018 | shares 406
Issued | $ / shares $ 4.55
Vested | $ / shares 4.55
Expected to vest at June 30, 2018 | $ / shares $ 4.55
Performance Vesting Restricted Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Issued | shares 2,600
Issued | $ / shares $ 31.74