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Share-Based Compensation, Common Stock Issuances, Redeemable Common Stock and Common Stock - Summary of Nonvested Restricted Stock Units (Detail)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance 737,496
Granted 737,190
Vested (473,184)
Forfeited (121,893)
Ending balance 879,609
Beginning balance | $ / shares $ 17.41
Granted | $ / shares 18.75
Vested | $ / shares 13.47
Forfeited | $ / shares 16.06
Ending balance | $ / shares $ 17.68
Time Based Restricted Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance 502,769
Granted 410,984
Vested (193,701)
Forfeited (82,716)
Ending balance 637,336
Performance Restricted Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance 234,727
Granted 326,206
Vested (279,483)
Forfeited (39,177)
Ending balance 242,273