Fair Value Measurements - Assets or Liabilities Recorded at Fair Value (Detail) (Significant Other Observable Inputs (Level 2) [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Cash surrender value of life insurance policies	$ 27,412	$ 25,301
Cash flow swaps designated as hedges	2,022	3,707
Total assets	29,434	29,008
Liabilities:
Cash flow swaps designated as hedges	11,088	17,995
Cash flow swaps not designated as hedges	1,578	2,046
Deferred compensation plan	15,917	14,842
Total liabilities	$ 28,583	$ 34,883