XML 73 R58.htm IDEA: XBRL DOCUMENT v3.3.1.900
Non-Vested Share Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares, Non-vested shares outstanding beginning 396 477
Shares, Granted 188 226
Shares, Vested (241) (307)
Shares, Cancelled (9)  
Shares, Non-vested shares outstanding ending 334 396
Shares, Non-vested shares vested or expected to vest 325  
Weighted Average Grant Date Fair Value, Non-vested shares outstanding beginning $ 10.87 $ 9.66
Weighted Average Grant Date Fair Value, Granted 17.19 13.04
Weighted Average Grant Date Fair Value, Vested 12.02 10.59
Weighted Average Grant Date Fair Value, Cancelled 4.30  
Weighted Average Grant Date Fair Value, Non-vested shares outstanding ending 13.77 $ 10.87
Weighted Average Grant Date Fair Value, Non-vested shares vested or expected to vest $ 13.74  
Aggregate Intrinsic Value, Non-vested shares outstanding ending $ 5,935  
Aggregate Intrinsic Value, Non-vested shares vested or expected to vest $ 5,775  
Performance Stock Units    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares, Granted 119  
Shares, Vested (20)  
Shares, Non-vested shares outstanding ending 99  
Weighted Average Grant Date Fair Value, Granted $ 22.94  
Weighted Average Grant Date Fair Value, Vested 21.73  
Weighted Average Grant Date Fair Value, Non-vested shares outstanding ending $ 23.19