Borrowing Arrangements - Additional Information (Detail) ¥ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 GBP (£)	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 CNY (¥)
Line of Credit Facility [Line Items]
Initial borrowing capacity	$ 750,000			£ 250,000	€ 400,000
Credit amount outstanding	0	$ 0
Future principal payments, next twelve months	26,825,000
Future principal payments, in year two	585,000
Future principal payments, in year three	24,257,000
Future principal payments, in year four	337,000
Future principal payments, in year five	210,000
Deferred financing fees	1,250,000
Notes issued	22,619,000	0	$ 0
Accrued interest	2,274,000	3,000
Industrial Revenue Bonds [Member]
Line of Credit Facility [Line Items]
Debt outstanding	$ 13,311,000	13,311,000
Promissory Notes (and Interest) [Member]
Line of Credit Facility [Line Items]
Debt, interest rate	6.50%			6.50%	6.50%	6.50%
Accrued interest	$ 1,225,000
Debt, maturity date	Mar. 03, 2019
Debt outstanding	$ 23,844,000	0
Promissory Notes (and Interest) [Member] | Akers AB [Member]
Line of Credit Facility [Line Items]
Notes issued	$ 22,619,000
Minority Shareholder Loan [Member]
Line of Credit Facility [Line Items]
Debt, interest rate	4.90%			4.90%	4.90%	4.90%
Accrued interest	$ 2,265,000					¥ 15,730
Debt outstanding	4,990,000	0				¥ 34,655
Credit Facilities [Member]
Line of Credit Facility [Line Items]
Initial borrowing capacity	$ 20,000,000
Debt instrument description of interest rate	Interest at 4% plus the higher of LIBOR or 1%
Debt instrument basis spread	4.00%
Credit amount outstanding	$ 7,146,000
Debt, interest rate	5.11%			5.11%	5.11%	5.11%
Collateral fee percentage	1.20%
Commitment fee percentage	0.50%
Debt instrument, maturity date	2017-06
Early termination fee percentage	2.00%
Early termination fee	$ 400,000
Fixed-Rate Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Initial borrowing capacity	$ 5,000,000
Debt instrument description of interest rate	Interest at 7.25% plus the higher of LIBOR or 1%.
Debt instrument basis spread	7.25%
Credit amount outstanding	$ 762,000
Debt, interest rate	9.16%			9.16%	9.16%	9.16%
Debt instrument, maturity date	2017-06
Early termination fee percentage	2.00%
Early termination fee	$ 400,000
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]
Revolving credit term	5 years
Additional borrowing capacity	$ 50,000,000
Line of credit, remaining borrowing capacity	54,000
Debt outstanding	$ 7,146,000	$ 0
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] | Capital Leases [Member]
Line of Credit Facility [Line Items]
Effective interest rate	1.20%			1.20%	1.20%	1.20%
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] | Capital Leases [Member]
Line of Credit Facility [Line Items]
Effective interest rate	5.30%			5.30%	5.30%	5.30%
Maximum [Member] | Credit Facility [Member]
Line of Credit Facility [Line Items]
Initial borrowing capacity	$ 100,000,000
Commitment fee payable percentage	0.375%
Fixed charge coverage ratio	1.00			1.00	1.00	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%
Tax Exempt Industrial Revenue Bond One [Member] | Industrial Revenue Bonds [Member]
Line of Credit Facility [Line Items]
Tax-exempt IRB maturing in 2020/2027/2029	$ 4,120,000
Interest at a floating rate on tax-exempt IRB maturing in 2020/2027/2029	0.50%			0.50%	0.50%	0.50%
Taxable Industrial Revenue Bond [Member] | Industrial Revenue Bonds [Member]
Line of Credit Facility [Line Items]
Tax-exempt IRB maturing in 2020/2027/2029	$ 7,116,000
Interest at a floating rate on tax-exempt IRB maturing in 2020/2027/2029	0.65%			0.65%	0.65%	0.65%
Tax Exempt Industrial Revenue Bond Two [Member] | Industrial Revenue Bonds [Member]
Line of Credit Facility [Line Items]
Tax-exempt IRB maturing in 2020/2027/2029	$ 2,075,000
Interest at a floating rate on tax-exempt IRB maturing in 2020/2027/2029	0.59%			0.59%	0.59%	0.59%