XML 18 R46.htm IDEA: XBRL DOCUMENT v3.3.0.814
Stock-based Compensation - Summary of Restricted Stock Units (Detail)
9 Months Ended
Sep. 30, 2015
$ / 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 90,255
Number of Shares, Granted 104,270
Number of Shares, Vested (90,255)
Number of Shares, Outstanding, Ending Balance 104,270
Weighted-Average Grant Date Fair Value, Beginning balance | $ / shares $ 7.04
Weighted-Average Grant Date Fair Value, Granted | $ / shares 6.25
Weighted-Average Grant Date Fair Value, Vested | $ / shares 7.04
Weighted-Average Grant Date Fair Value, Ending balance | $ / shares $ 6.25
Performance-Based Restricted Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Outstanding, Beginning Balance 321,525
Number of Shares, Granted 76,375
Number of Shares, Vested (137,127)
Number of Shares, Forfeited or expired (25,123)
Number of Shares, Outstanding, Ending Balance 235,650
Weighted-Average Grant Date Fair Value, Beginning balance | $ / shares $ 6.41
Weighted-Average Grant Date Fair Value, Granted | $ / shares 6.14
Weighted-Average Grant Date Fair Value, Vested | $ / shares 6.09
Weighted-Average Grant Date Fair Value, Forfeited or expired | $ / shares 6.23
Weighted-Average Grant Date Fair Value, Ending balance | $ / shares $ 6.52