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Outstanding and Exercisable Share Options (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 41.25
Range Exercise Price Minimum $ 11.00
Options Outstanding Number of Shares 2,973,788
Options Outstanding Weighted Average Remaining Contractual Life 4 years 6 months 7 days
Options Outstanding Weighted Average Exercise Price $ 24.20
Options Exercisable Number of Shares 1,505,707
Options Exercisable Weighted Average Exercise Price $ 24.92
Range 1
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 11.00
Options Outstanding Number of Shares 24,140
Options Outstanding Weighted Average Remaining Contractual Life 1 month 2 days
Options Outstanding Weighted Average Exercise Price $ 11.00
Options Exercisable Number of Shares 24,140
Options Exercisable Weighted Average Exercise Price $ 11.00
Range 2
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 15.47
Options Outstanding Number of Shares 180
Options Outstanding Weighted Average Remaining Contractual Life 3 years 3 months 29 days
Options Outstanding Weighted Average Exercise Price $ 15.47
Options Exercisable Weighted Average Exercise Price $ 15.47
Range 3
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 15.84
Options Outstanding Number of Shares 50,000
Options Outstanding Weighted Average Remaining Contractual Life 3 years 3 months 29 days
Options Outstanding Weighted Average Exercise Price $ 15.84
Options Exercisable Number of Shares 40,000
Options Exercisable Weighted Average Exercise Price $ 15.84
Range 4
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 16.80
Options Outstanding Number of Shares 150,000
Options Outstanding Weighted Average Remaining Contractual Life 5 years 9 months 29 days
Options Outstanding Weighted Average Exercise Price $ 16.80
Options Exercisable Number of Shares 60,000
Options Exercisable Weighted Average Exercise Price $ 16.80
Range 5
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 17.17
Options Outstanding Number of Shares 30,000
Options Outstanding Weighted Average Remaining Contractual Life 5 years 10 months 6 days
Options Outstanding Weighted Average Exercise Price $ 17.17
Options Exercisable Number of Shares 12,000
Options Exercisable Weighted Average Exercise Price $ 17.17
Range 6
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 18.00
Options Outstanding Number of Shares 24,000
Options Outstanding Weighted Average Remaining Contractual Life 9 months 29 days
Options Outstanding Weighted Average Exercise Price $ 18.00
Options Exercisable Number of Shares 24,000
Options Exercisable Weighted Average Exercise Price $ 18.00
Range 7
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 18.98
Options Outstanding Number of Shares 6,600
Options Outstanding Weighted Average Remaining Contractual Life 2 years 10 months 13 days
Options Outstanding Weighted Average Exercise Price $ 18.98
Options Exercisable Number of Shares 6,600
Options Exercisable Weighted Average Exercise Price $ 18.98
Range 8
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 19.45
Options Outstanding Number of Shares 15,000
Options Outstanding Weighted Average Remaining Contractual Life 4 years 9 months 26 days
Options Outstanding Weighted Average Exercise Price $ 19.45
Options Exercisable Number of Shares 1,800
Options Exercisable Weighted Average Exercise Price $ 19.45
Range 9
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 20.16
Options Outstanding Number of Shares 2,000
Options Outstanding Weighted Average Remaining Contractual Life 4 years 10 months 13 days
Options Outstanding Weighted Average Exercise Price $ 20.16
Options Exercisable Number of Shares 1,200
Options Exercisable Weighted Average Exercise Price $ 20.16
Range 10
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 20.28
Options Outstanding Number of Shares 457,871
Options Outstanding Weighted Average Remaining Contractual Life 5 years 2 months 1 day
Options Outstanding Weighted Average Exercise Price $ 20.28
Options Exercisable Number of Shares 177,987
Options Exercisable Weighted Average Exercise Price $ 20.28
Range 11
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 20.59
Options Outstanding Number of Shares 162,000
Options Outstanding Weighted Average Remaining Contractual Life 6 years 1 month 21 days
Options Outstanding Weighted Average Exercise Price $ 20.59
Options Exercisable Number of Shares 20,400
Options Exercisable Weighted Average Exercise Price $ 20.59
Range 12
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 21.25
Options Outstanding Number of Shares 231,751
Options Outstanding Weighted Average Remaining Contractual Life 1 year 1 month 13 days
Options Outstanding Weighted Average Exercise Price $ 21.25
Options Exercisable Number of Shares 231,751
Options Exercisable Weighted Average Exercise Price $ 21.25
Range 13
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 22.10
Options Outstanding Number of Shares 400
Options Outstanding Weighted Average Remaining Contractual Life 3 years 6 months 22 days
Options Outstanding Weighted Average Exercise Price $ 22.10
Options Exercisable Weighted Average Exercise Price $ 22.10
Range 14
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 22.26
Options Outstanding Number of Shares 233,927
Options Outstanding Weighted Average Remaining Contractual Life 3 years 1 month 24 days
Options Outstanding Weighted Average Exercise Price $ 22.26
Options Exercisable Number of Shares 155,161
Options Exercisable Weighted Average Exercise Price $ 22.26
Range 15
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 22.30
Options Outstanding Number of Shares 475,333
Options Outstanding Weighted Average Remaining Contractual Life 6 years 3 months 26 days
Options Outstanding Weighted Average Exercise Price $ 22.30
Options Exercisable Number of Shares 82,326
Options Exercisable Weighted Average Exercise Price $ 22.30
Range 16
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 23.66
Options Outstanding Number of Shares 8,900
Options Outstanding Weighted Average Remaining Contractual Life 6 years 6 months 26 days
Options Outstanding Weighted Average Exercise Price $ 23.66
Options Exercisable Number of Shares 1,780
Options Exercisable Weighted Average Exercise Price $ 23.66
Range 17
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 24.25
Options Outstanding Number of Shares 100,000
Options Outstanding Weighted Average Remaining Contractual Life 4 years 2 months 5 days
Options Outstanding Weighted Average Exercise Price $ 24.25
Options Exercisable Number of Shares 100,000
Options Exercisable Weighted Average Exercise Price $ 24.25
Range 18
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 24.46
Options Outstanding Number of Shares 343,677
Options Outstanding Weighted Average Remaining Contractual Life 4 years 2 months 1 day
Options Outstanding Weighted Average Exercise Price $ 24.46
Options Exercisable Number of Shares 172,209
Options Exercisable Weighted Average Exercise Price $ 24.46
Range 19
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 26.20
Options Outstanding Number of Shares 2,400
Options Outstanding Weighted Average Remaining Contractual Life 4 years 4 months 17 days
Options Outstanding Weighted Average Exercise Price $ 26.20
Options Exercisable Number of Shares 1,440
Options Exercisable Weighted Average Exercise Price $ 26.20
Range 20
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 26.71
Options Outstanding Number of Shares 7,650
Options Outstanding Weighted Average Remaining Contractual Life 6 years 8 months 12 days
Options Outstanding Weighted Average Exercise Price $ 26.71
Options Exercisable Number of Shares 4,090
Options Exercisable Weighted Average Exercise Price $ 26.71
Range 21
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 29.45
Options Outstanding Number of Shares 3,000
Options Outstanding Weighted Average Remaining Contractual Life 4 years 3 months 26 days
Options Outstanding Weighted Average Exercise Price $ 29.45
Options Exercisable Number of Shares 1,800
Options Exercisable Weighted Average Exercise Price $ 29.45
Range 22
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 31.49
Options Outstanding Number of Shares 12,450
Options Outstanding Weighted Average Remaining Contractual Life 7 years 1 month 28 days
Options Outstanding Weighted Average Exercise Price $ 31.49
Options Exercisable Weighted Average Exercise Price $ 31.49
Range 23
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 32.37
Options Outstanding Number of Shares 200,203
Options Outstanding Weighted Average Remaining Contractual Life 7 years 3 months 29 days
Options Outstanding Weighted Average Exercise Price $ 32.37
Options Exercisable Number of Shares 2,500
Options Exercisable Weighted Average Exercise Price $ 32.37
Range 24
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 35.33
Options Outstanding Number of Shares 377,523
Options Outstanding Weighted Average Remaining Contractual Life 2 years 1 month 24 days
Options Outstanding Weighted Average Exercise Price $ 35.33
Options Exercisable Number of Shares 377,523
Options Exercisable Weighted Average Exercise Price $ 35.33
Range 25
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 36.05
Options Outstanding Number of Shares 6,000
Options Outstanding Weighted Average Remaining Contractual Life 2 years 4 months 24 days
Options Outstanding Weighted Average Exercise Price $ 36.05
Options Exercisable Number of Shares 6,000
Options Exercisable Weighted Average Exercise Price $ 36.05
Range 26
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 36.22
Options Outstanding Number of Shares 37,483
Options Outstanding Weighted Average Remaining Contractual Life 7 years 5 months 16 days
Options Outstanding Weighted Average Exercise Price $ 36.22
Options Exercisable Weighted Average Exercise Price $ 36.22
Range 27
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 37.90
Options Outstanding Number of Shares 10,300
Options Outstanding Weighted Average Remaining Contractual Life 7 years 11 months 5 days
Options Outstanding Weighted Average Exercise Price $ 37.90
Options Exercisable Weighted Average Exercise Price $ 37.90
Range 28
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range Exercise Price Maximum $ 41.25
Options Outstanding Number of Shares 1,000
Options Outstanding Weighted Average Remaining Contractual Life 2 years 8 months 1 day
Options Outstanding Weighted Average Exercise Price $ 41.25
Options Exercisable Number of Shares 1,000
Options Exercisable Weighted Average Exercise Price $ 41.25