Borrowing Arrangements - Additional Information (Detail)	1 Months Ended	3 Months Ended
	Apr. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Initial borrowing capacity		$ 40,000,000
Credit Facility [Member]
Line of Credit Facility [Line Items]
Initial term of credit facility		5 years
Initial borrowing capacity		$ 100,000,000
Additional borrowing capacity		50,000,000
Line of credit, remaining borrowing capacity		$ 57,000,000
Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Initial term of credit facility	3 months
Credit amount outstanding	$ 7,000,000
Interest on outstanding balance	2.68%
Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt instrument description of interest rate		LIBOR plus an applicable margin ranging between 1.25% to 1.75%
Credit Facility [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Debt instrument description of interest rate		Base Rate plus an applicable margin ranging between 0.25% to 0.75%
European Credit Facility [Member]
Line of Credit Facility [Line Items]
Initial borrowing capacity		$ 15,000,000
Canadian Credit Facility [Member]
Line of Credit Facility [Line Items]
Initial borrowing capacity		$ 15,000,000
Minimum [Member] | Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment fee payable percentage		0.25%
Minimum [Member] | Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt instrument basis spread		1.25%
Minimum [Member] | Credit Facility [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Debt instrument basis spread		0.25%
Maximum [Member] | Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment fee payable percentage		0.375%
Fixed charge coverage ratio		1.00
Maximum [Member] | Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Debt instrument basis spread		1.75%
Maximum [Member] | Credit Facility [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Debt instrument basis spread		0.75%