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Share Based Compensation - Summarized Activity of Restricted Stock Awards (Detail) - Restricted Stock
shares in Thousands
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Balance at beginning of year | shares 4
Granted, equivalent units | shares 0
Vested, equivalent units | shares (4)
Forfeited, equivalent units | shares 0
Balance at end of period | shares 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Non-vested at beginning of year, weighted average grant date fair value | $ / shares $ 20.55
Granted, weighted average grant date fair value | $ / shares 0.00
Vested, Weighted Average Grant Date Fair Value | $ / shares 20.55
Forfeited, weighted average grant date | $ / shares 0.00
Non-vested at end of period, weighted average grant date fair value | $ / shares $ 0.00