Pension and Profit Sharing Plans - Pension Plan and Targeted Allocation Percentage (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Allocation	75.00%	75.00%
Targeted Allocation	75.00%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Allocation	24.00%	24.00%
Targeted Allocation	25.00%
Cash and Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Allocation	1.00%	1.00%