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Share-Based Compensation - Summary of Total Number of SARs Granted (Detail) (Stock Appreciation Rights (SARs), USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Stock Appreciation Rights (SARs)
 
Number of Share units  
Nonvested number of Units, beginning balance 2,995
Granted, number of units 0
Vested, number of units (380)
Forfeited, number of units (140)
Nonvested number of units, ending balance 2,475
Weighted Average Grant Date Fair Value  
Nonvested weighted Average Grant Date Fair Value, beginning balance $ 6.42
Granted, weighted average grant date fair value $ 0.00
Vested, weighted average grant date fair value $ 6.48
Forfeited, weighted average grant date fair value $ 6.69
Nonvested weighted Average Grant Date Fair Value, ending balance $ 6.39