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Share-Based Compensation - Schedule of Deferred Stock Units to be Settled in Shares (Detail)
 6 Months Ended
Jun. 30, 2016
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Beginning balance of Outstanding Shares 91,000 [1]
Granted, Shares 0
Vested, Shares (15,000)
Forfeited, Shares 0
Ending balance of Outstanding Shares 76,000 [1]
Beginning balance of Weighted Average Grant-Date Fair Value Per Unit | $ / shares $ 4.43 [1]
Vested, Weighted Average Grant-Date Fair Value Per Unit | $ / shares 4.39
Ending balance of Weighted Average Grant-Date Fair Value Per Unit | $ / shares $ 4.44 [1]
[1] Includes vested but unreleased awards. These awards are included in total outstanding awards until they are released under the terms of the agreement