Subsequent Event - Additional Information (Detail)		12 Months Ended
	Mar. 02, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 GBP (£)	Dec. 31, 2016 EUR (€)
Subsequent Event [Line Items]
Initial borrowing capacity		$ 750,000			£ 250,000	€ 400,000
Repayment of outstanding balance of credit facility and term loan		11,217,000	$ 0	$ 0
Credit Facilities [Member]
Subsequent Event [Line Items]
Initial borrowing capacity		$ 20,000,000
Subsequent Event [Member] | Credit Facilities [Member]
Subsequent Event [Line Items]
Repayment of outstanding balance of credit facility and term loan	$ 7,596,000
Subsequent Event [Member] | Europe [Member] | Maximum [Member]
Subsequent Event [Line Items]
Initial borrowing capacity	25,000,000
Subsequent Event [Member] | Europe [Member] | Minimum [Member]
Subsequent Event [Line Items]
Initial borrowing capacity	15,000,000
Subsequent Event [Member] | CANADA
Subsequent Event [Line Items]
Initial borrowing capacity	$ 15,000,000