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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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- Details

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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

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