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Benefit Plans - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Number of Options Outstanding, Beginning Balance 2,961 2,661 2,596
Number of Options, Granted 557 774 345
Number of Options, Exercised (234) (154) (87)
Number of Options, Forfeited (472) (320) (193)
Number of Options Outstanding, Ending Balance 2,812 2,961 2,661
Number of Options exercisable 1,760 1,922 2,052
Weighted Average Exercise Price, Beginning balance $ 22.48 $ 24.77 $ 25.70
Weighted Average Exercise Price, Granted 19.26 16.61 16.91
Weighted Average Exercise Price, Exercised 12.85 10.02 9.25
Weighted Average Exercise Price, Forfeited 36.51 33.40 28.10
Weighted Average Exercise Price, Ending balance 20.29 22.48 24.77
Weighted Average Exercise Price, Options exercisable $ 21.69 $ 25.75 $ 27.53
Weighted-Average Remaining Contractual Term (Years), Ending Balance 5 years 7 months 6 days    
Weighted-Average Remaining Contractual Term (Years), Options exercisable 4 years 2 months 12 days 4 years 4 years 1 month 6 days
Aggregate Intrinsic Value, Ending balance $ 6,867    
Aggregate Intrinsic Value, Options exercisable $ 6,764 $ 9,077 $ 6,491