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Share-Based Compensation - Schedule of Deferred Stock Units to be Settled in Shares (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Beginning balance of Outstanding, Deferred Stock Units to be Settled in Shares [1] 76,023 76,023 90,642
Granted, Deferred Stock Units to be Settled in Shares 0 0 0
Vested, Deferred Stock Units to be Settled in Shares 0 0 (14,619)
Forfeited, Deferred Stock Units to be Settled in Shares 0 0 0
Ending balance of Outstanding, Deferred Stock Units to be Settled in Shares [1] 76,023 76,023 76,023
Beginning balance of Outstanding, Weighted Average Grant-Date Fair Value Per Unit [1] $ 4.44 $ 4.44 $ 4.43
Granted, Weighted Average Grant-Date Fair Value Per Unit 0 0 0
Vested, Weighted Average Grant-Date Fair Value Per Unit 0 0 4.39
Forfeited, Weighted Average Grant-Date Fair Value Per Unit 0 0 0
Ending balance of Outstanding, Weighted Average Grant-Date Fair Value Per Unit [1] $ 4.44 $ 4.44 $ 4.44
[1] Includes vested but unreleased awards. These awards are included in total outstanding awards until they are released under the terms of the agreement.