Borrowings - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016	Dec. 31, 2016 USD ($)
Credit Facilities [Line Items]
Other short-term borrowings	$ 10,000		$ 10,000
Revolving Credit Facility
Credit Facilities [Line Items]
Credit facility capacity	100,000
Revolving credit facility	$ 45,000
Credit facility expiration date	Oct. 24, 2019
Other short-term borrowings	$ 10,000
Line of credit interest rate during period (as a percent)	2.50%	1.90%
Unamortized debt issuance costs	$ 248		$ 272
Interest coverage ratio, minimum	3.5
Leverage ratio, minimum	2.5