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Employee benefit plans - Fair Value Measurement of Pension Plan Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Cash | $ 12,417 | $ 11,343
Cash [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash | 316 | 419
Equity Securities [Member] | U.S. Large Cap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash | 6,993 | 6,068
Equity Securities [Member] | International [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash | 442 | 307
Fixed Income Securities [Member] | U.S. Treasuries [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash | 995 | 1,024
Fixed Income Securities [Member] | U.S. Government Agencies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash | 1,579 | 1,380
Fixed Income Securities [Member] | Corporate Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash | 2,092 | 2,145
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash | 7,751 | 6,794
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash | 316 | 419
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | U.S. Large Cap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash | 6,993 | 6,068
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | International [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash | 442 | 307
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income Securities [Member] | U.S. Treasuries [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income Securities [Member] | U.S. Government Agencies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income Securities [Member] | Corporate Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash |  |
Significant Observable Inputs (Level 2) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash | 4,666 | 4,549
Significant Observable Inputs (Level 2) [Member] | Cash [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash |  |
Significant Observable Inputs (Level 2) [Member] | Equity Securities [Member] | U.S. Large Cap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash |  |
Significant Observable Inputs (Level 2) [Member] | Equity Securities [Member] | International [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash |  |
Significant Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member] | U.S. Treasuries [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash | 995 | 1,024
Significant Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member] | U.S. Government Agencies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash | 1,579 | 1,380
Significant Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member] | Corporate Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash | 2,092 | 2,145
Significant Unobservable Inputs (Level 3) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash |  |
Significant Unobservable Inputs (Level 3) [Member] | Cash [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash |  |
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] | U.S. Large Cap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash |  |
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] | International [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash |  |
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income Securities [Member] | U.S. Treasuries [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash |  |
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income Securities [Member] | U.S. Government Agencies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash |  |
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income Securities [Member] | Corporate Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Cash |  |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + 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 (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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