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Share-Based Employee Compensation - Summary of Total Number of SARs Granted (Detail) - Stock Appreciation Rights (SARs)
shares in Thousands
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Number of Share units  
Nonvested number of Units, beginning balance | shares 2,372
Granted, number of units | shares 0
Exercised, number of units | shares (1,874)
Forfeited, number of units | shares 0
Vested, number of units, ending balance | shares 498
Weighted Average Grant Date Fair Value  
Nonvested weighted Average Grant Date Fair Value, beginning balance | $ / shares $ 6.39
Granted, weighted average grant date fair value | $ / shares 0.00
Exercised, weighted average exercise price | $ / shares 6.35
Forfeited, weighted average grant date fair value | $ / shares 0.00
Vested, Weighted Average Grant Date Fair Value, ending balance | $ / shares $ 6.51