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Share-Based Compensation - Schedule of Deferred Stock Units to be Settled in Shares (Detail)
shares in Thousands
 9 Months Ended
Sep. 30, 2015
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Beginning balance of Outstanding Shares 117
Granted, Shares 3
Vested, Shares (15) [1]
Ending balance of Outstanding Shares 105
Beginning balance of Weighted Average Grant-Date Fair Value Per Unit | $ / shares $ 4.39
Granted, Weighted Average Grant-Date Fair Value Per Unit | $ / shares 5.73
Vested, Weighted Average Grant-Date Fair Value Per Unit | $ / shares 4.39 [1]
Ending balance of Weighted Average Grant-Date Fair Value Per Unit | $ / shares $ 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.