Benefit Plans - Schedule of Fair Value Hierarchy, the Company's Pension Plan Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Total	$ 4,329	$ 4,046	$ 3,454
Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	1,697	1,023	1,409
Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	2,632	3,023	2,045
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	4,329	4,046	3,454
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	1,697	1,023	1,409
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	2,632	3,023	2,045
Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
Significant Other Observable Inputs (Level 2) [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
Significant Other Observable Inputs (Level 2) [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
Significant Unobservable Inputs (Level 3) [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total