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Fair Value Measurements - Assets and Liabilities Recorded at Fair Value (Detail) - Fair Value Based on Significant Other Observable Inputs (Level 2) [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Assets: |  |
Cash surrender value of life insurance policies | $ 33,747 | $ 31,475
Cash flow swaps and interest rate caps designated as hedges | 5,968 | 2,772
Total assets | 39,715 | 34,247
Liabilities: |  |
Cash flow swaps designated as hedges | 1,286 | 6,135
Cash flow swaps not designated as hedges |  | 346
Deferred compensation plan | 18,417 | 14,824
Total liabilities | $ 19,703 | $ 21,305

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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