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Stock-Based Employee Compensation Plans - Additional Information With Respect to Restricted Stock Units and Performance Units (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Percentage of number of shares that may be earned related to performance units, Minimum 0.00%cb_PercentageOfSharesEarnedRelatedToPerformanceUnitsMinimum
Percentage of number of shares that may be earned related to performance units, Maximum 200.00%cb_PercentageOfSharesEarnedRelatedToPerformanceUnitsMaximum
Percentage of performance units earned as it relates to vested shares 35.20%cb_PercentageOfVestedSharesEarnedRelatedToPerformanceUnits
Number of performance units earned as it relates to vested shares 160,574cb_NumberOfVestedSharesEarnedRelatedToPerformanceUnits