Pension and Employee Benefit Plans - Schedule of Changes in Projected Benefit Obligations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Change in projected benefit obligation:
Service cost	$ 126	$ 58
Interest cost	676	328
Change in plan assets:
Fair value of plan assets at beginning of year	5,549
Fair value of plan assets at end of year	25,822	5,549
Weighted-average assumptions used to determine benefit obligations for the year ended December 31:
Discount rate		4.25%
Compensation increase rate
Other Postretirement Benefit Plan, Defined Benefit [Member]
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	89
Accumulated postretirement benefit obligation	89	146
Projected benefit obligation from acquisition
Service cost
Interest cost	3	6
Amendments	44
Actuarial (gain)/loss	8	(43)
Administrative expenses
Benefits paid	(28)	(20)
Projected benefit obligation at end of year	116	89
Projected benefit obligation at end of year	116	89
Change in plan assets:
Fair value of plan assets at beginning of year
Fair value of plan assets from acquisition
Actual return on plan assets
Employer contribution	28	20
Administrative expenses
Benefits paid	(28)	(20)
Fair value of plan assets at end of year
Funded status	(116)	(89)
Defined benefit liabilities included in accounts payable and accrued expenses	(21)	(15)
Defined benefit liabilities included in other liabilities	(95)	(74)
Deferred tax benefit (expense) associated with AOCL	(18)	(45)
AOCL, net of tax	(27)	(67)
Net amount recognized	(161)	(201)
Other comprehensive (income) loss:
Net loss (gain)	8	(43)
Prior service cost	44
Amortization of prior service cost
Amortization of net actuarial loss	14	8
Total recognized in other comprehensive (income) loss	66	(35)
Accumulated other comprehensive (income) loss:
Net (gain) loss	(89)	(112)
Prior service cost	44
Amount recognized in accumulated other comprehensive (income)	(45)	(112)
Weighted-average assumptions used to determine benefit obligations for the year ended December 31:
Discount rate	4.50%	3.75%
Compensation increase rate
Pension plan [Member]
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	8,535	7,886
Projected benefit obligation from acquisition	24,364
Service cost	126	58
Interest cost	676	328
Actuarial (gain)/loss	(509)	629
Administrative expenses	(126)
Benefits paid	(755)	(366)
Projected benefit obligation at end of year	32,311	8,535
Projected benefit obligation at end of year	32,311	8,535
Change in plan assets:
Fair value of plan assets at beginning of year	5,549	5,020
Fair value of plan assets from acquisition	18,654
Actual return on plan assets	2,291	603
Employer contribution	209	292
Administrative expenses	(126)
Benefits paid	(755)	(366)
Fair value of plan assets at end of year	25,822	5,549
Funded status	(6,489)	(2,986)
Defined benefit liabilities included in other liabilities	(6,489)	(2,986)
Deferred tax benefit (expense) associated with AOCL	608	1,505
AOCL, net of tax	856	2,257
Net amount recognized	(5,025)	776
Other comprehensive (income) loss:
Net loss (gain)	(1,926)	404
Amortization of prior service cost	(1)	(1)
Amortization of net actuarial loss	(370)	(332)
Total recognized in other comprehensive (income) loss	(2,297)	71
Accumulated other comprehensive (income) loss:
Net (gain) loss	1,460	3,757
Prior service cost	4	5
Amount recognized in accumulated other comprehensive (income)	$ 1,464	$ 3,761
Weighted-average assumptions used to determine benefit obligations for the year ended December 31:
Discount rate	4.50%	3.75%
Compensation increase rate