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Summary of Status of Restricted Stock Units and Changes (Detail) - Restricted Stock Units - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of Nonvested Stock Units      
Nonvested at beginning period 2,160 3,921 7,018
Restricted stock units granted 2,000 1,923 1,893
Restricted stock units vested (2,003) (3,640) (4,867)
Restricted stock units forfeited (32) (44) (123)
Nonvested at ending period 2,125 2,160 3,921
Weighted Average Grant Date Fair Value      
Nonvested at beginning period $ 4.90 $ 2.90 $ 2.68
Restricted stock units granted 6.83 5.13 3.13
Restricted stock units vested 4.96 2.96 2.60
Restricted stock units forfeited 5.85 4.92 2.60
Nonvested at ending period $ 6.65 $ 4.90 $ 2.90
Weighted Average Remaining Recognition Period (Years)      
Nonvested at ending period 8 months 23 days 3 months 22 days 5 months 5 days