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Share-based Compensation - Summary of Stock-Settled SARs Activity (Detail) - Stock-Settled SARs Activity [Member]
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Outstanding at January 1, 2016 | shares 1,438,146
Granted, Shares | shares 542
Converted from cash-settled SARs | shares 944,046
Exercised, Shares | shares (251,134)
Expired or forfeited, Shares | shares (148,905)
Shares, Outstanding at December 31, 2016 | shares 1,982,695
Vested or expected to vest as of year end, Shares | shares 1,808,016
Exercisable at end of year, Shares | shares 851,491
Weighted-Average Exercise Price, Outstanding at January 1, 2016 | $ / shares $ 29.52
Granted, Weighted-Average Exercise Price | $ / shares 36.71
Converted from cash-settled SARs | $ / shares 41.21
Exercised, Weighted-Average Exercise Price | $ / shares 24.46
Expired or forfeited, Weighted-Average Exercise Price | $ / shares 41.93
Weighted-Average Exercise Price, Outstanding at December 31, 2016 | $ / shares 34.80
Vested or expected to vest as of year end, Weighted-Average Exercise Price | $ / shares 20.19
Exercisable at end of year, Weighted-Average Exercise Price | $ / shares $ 30.02