Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Assets and Liabilities Recorded at Fair Value (Detail)

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Fair Value Measurements - Assets and Liabilities Recorded at Fair Value (Detail) - Significant Other Observable Inputs (Level 2) [Member] - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Assets:    
Cash surrender value of life insurance policies $ 28,683 $ 27,552
Cash flow swaps designated as hedges   618
Total assets 28,683 28,170
Liabilities:    
Cash flow swaps designated as hedges 13,905 10,251
Cash flow swaps not designated as hedges 1,125 1,469
Deferred compensation plan 15,553 15,863
Total liabilities $ 30,583 $ 27,583