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Employee benefit plans - Schedule of Weighted-Average Assumptions Used to Determine Benefit Obligations (Detail) | Dec. 31, 2013 | Dec. 31, 2012
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Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate | 5.00% | 4.25%
Expected long-term return on plan assets | 7.50% | 7.50%
Rate of compensation increase |  |
Postretirement Life Insurance Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate |  | 4.25%
Expected long-term return on plan assets |  |
Rate of compensation increase |  | 3.00%

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- Definition Defined Benefit Plan Assumptions Used Calculating Benefit Obligations Cost Expected Long Term Return On Assets + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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