Employee Benefit Plans - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015 Age
Defined Contribution Plan Disclosure [Line Items]
Minimum age of full-time employees	21
Conditional age-1 for availing plan	55
Conditional age-2 for availing plan	65
Conditional years of service -1 for availing plan	10 years
Conditional years of service-2 for availing plan	5 years
Pension Plan, Defined Benefit
Defined Contribution Plan Disclosure [Line Items]
Expected employer contribution	0
Other Postretirement Benefit Plan, Defined Benefit
Defined Contribution Plan Disclosure [Line Items]
Expected employer contribution	11,000
Employer contribution	3,000