XML 58 R44.htm IDEA: XBRL DOCUMENT v3.10.0.1
Stock-Based Compensation - Summary of Restricted Stock Units (Detail)
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Time-Based Restricted Stock Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares, Outstanding, Beginning Balance | shares 818,480
Number of Shares, Granted | shares 269,181
Number of Shares, Vested | shares (388,138)
Number of Shares, Forfeited or expired | shares (44,004)
Number of Shares, Outstanding, Ending Balance | shares 655,519
Weighted-Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 9.95
Weighted-Average Grant Date Fair Value, Granted | $ / shares 9.94
Weighted-Average Grant Date Fair Value, Vested | $ / shares 9.17
Weighted-Average Grant Date Fair Value, Forfeited or expired | $ / shares 10.37
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares $ 10.04
Performance-Based Restricted Stock Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares, Outstanding, Beginning Balance | shares 444,734
Number of Shares, Granted | shares 62,151
Number of Shares, Vested | shares (168,068)
Number of Shares, Forfeited or expired | shares (45,801)
Number of Shares, Outstanding, Ending Balance | shares 293,016
Weighted-Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 9.48
Weighted-Average Grant Date Fair Value, Granted | $ / shares 9.65
Weighted-Average Grant Date Fair Value, Vested | $ / shares 9.16
Weighted-Average Grant Date Fair Value, Forfeited or expired | $ / shares 7.50
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares $ 9.91