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Share-Based Compensation - Schedule of Deferred Stock Units to be Settled in Shares (Detail) - 6 months ended Jun. 30, 2015 - $ / shares
shares in Thousands
Total
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Beginning balance of Outstanding Shares 117
Granted, Shares 3
Vested, Shares [1] (15)
Forfeited, Shares 0
Ending balance of Outstanding Shares 105
Beginning balance of Weighted Average Grant-Date Fair Value Per Unit $ 4.39
Granted, Weighted Average Grant-Date Fair Value Per Unit 5.73
Vested, Weighted Average Grant-Date Fair Value Per Unit [1] 4.39
Forfeited, Weighted Average Grant-Date Fair Value Per Unit 0
Ending balance of Weighted Average Grant-Date Fair Value Per Unit $ 4.43
[1] The total vested awards exclude 0.3 thousand of vested but, unreleased awards. These awards are included in total outstanding awards until they are released under the terms of the agreement.