Guarantees - Additional Information (Detail) $ in Thousands	Mar. 31, 2016 USD ($)
Guarantor Obligations [Line Items]
Guarantor obligations, standby letters of credit	$ 205,200
Liability related to standby letters of credit	735
Secured
Guarantor Obligations [Line Items]
Guarantor obligations, standby letters of credit	$ 134,000
Percent of secured letters of credit	65.30%