Pension and Employee Benefit Plans - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013 Plans
Defined Benefit Plan Disclosure [Line Items]
Number Of Defined Benefit Pension Plans, acquired			2
Defined benefit plan contributions	$ 900,000	$ 100,000
Unfunded liability plans	6,400,000		6,400,000
Pension plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Anticipated contribution to fund the pension plan during the reminder of the fiscal year	1,000,000
Health care plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Anticipated contribution to fund the pension plan during the reminder of the fiscal year	$ 21,000.0