Employee Benefit Plans - Additional Information (Detail) - 6 months ended Jun. 30, 2015	USD ($) 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 | $	5,000
Employer contribution | $	$ 5,000