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
Jun. 30, 2015
Dec. 31, 2014
Assets:    
Cash surrender value of life insurance policies $ 29,674 $ 27,552
Cash flow swaps designated as hedges   618
Total assets 29,674 28,170
Liabilities:    
Cash flow swaps designated as hedges 9,683 10,251
Cash flow swaps not designated as hedges 1,233 1,469
Deferred compensation plan 16,361 15,863
Total liabilities $ 27,277 $ 27,583