Employee Benefit Plans - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Supplemental executive retirement plan	$ 10,624,000		$ 10,197,000
Foreign Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan arrangement minimum age	60 years
Completed at least credited service period	5 years
Defined benefit plan assumptions used calculating benefit obligation benefits payable per service year	one-half month’s salary for each year of credited service
Net periodic benefit cost	66,000	64,000
Defined benefit plan, benefit obligation	1,700,000		1,600,000
Supplemental Executive Retirement Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan arrangement minimum age	55 years
Completed at least credited service period	10 years
Net periodic benefit cost	426,000	365,000
Normal retirement age	65 years
Early retirement age	55 years
Vesting percentage under the plan for attaining age 55 and 10 years of service	100.00%
Vesting percentage under the plan prior to attaining age 55 and 10 years of service	0.00%
Defined benefit plan employees minimum requisition period under specific conditions	5 years
Benefits payable targeted percentage	45.00%
Period in which the executive officer earned the highest salary and bonus	3 years
Employment Period For Computation Of Benefit	10 years
Eligible service under condition one for reduced benefits under plan	10 years
Eligible age under condition one for reduced benefits under the plan	62 years
Eligible age under condition two for reduced benefits under plan	55 years
Eligible service under condition two for reduced benefits under plan	25 years
Lump sum payment period	10 years
Supplemental executive retirement plan	10,600,000		10,200,000
Contributions made to the SERP	0
Supplemental Executive Retirement Health Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost		(38,000)
Lump-sum payment to the participant in SERHP		600,000
Settlement gain (loss)		$ 122,000