XML 116 R93.htm IDEA: XBRL DOCUMENT v3.6.0.2
Share Based Compensation - Summarized Activity of Cash-Settled Stock Appreciation Rights (Detail) - Stock Appreciation Rights (SARs) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Balance at beginning of year 487  
Granted, rights outstanding 0  
Exercised, rights outstanding (52)  
Forfeited, rights outstanding (61)  
Balance at end of period 374 487
Exercisable at end of period, rights outstanding 345  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Non-vested at beginning of year, weighted average grant date fair value $ 12.97  
Granted, weighted average exercise price 0.00  
Exercised, weighted average exercise price 9.29  
Forfeited, weighted average grant date 16.12  
Non-vested at end of period, weighted average grant date fair value 12.97 $ 12.97
Exercisable at end of period, weighted average exercise price $ 12.87  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]    
Exercisable at end of period, weighted average remaining contractual terms 3 years 4 years
Weighted average remaining contractual term 3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]    
Aggregate intrinsic value $ 773 $ 404
Exercisable at end of period, aggregate intrinsic value $ 773