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Debt and Credit Arrangements - Additional Information (Detail) AUD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2015 AUD | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |
Line of credit | $ 50,000,000 |  |  |
Expiring date of Australian Bank Bill Swap Bid Rate | 2017-01 | 2017-01 |  |
Interest rate of LIBOR plus | 1.125% | 1.125% |  |
Line of credit remaining borrowing capacity | $ 16,800,000 |  |  |
Aggregate maturities of long-term debt for 2016 | 100,000 |  |  |
Aggregate maturities of long-term debt for 2017 | 31,700,000 |  |  |
Aggregate maturities of long-term debt there after | 0 |  |  |
Interest paid | 500,000 |  | $ 600,000 | $ 400,000
Total outstanding guarantees | 500,000 |  |  |
Letter of credit outstanding | 6,100,000 |  |  |
Subsidiaries [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit | $ 5,000,000 |  |  |
Australian Subsidiaries [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Expiring date of Australian Bank Bill Swap Bid Rate | 2017-08 | 2017-08 |  |
Borrowings | AUD |  | AUD 1.5 |  |
Interest rate for Line of credit | 3.185% |  |  |
Australian Subsidiaries [Member] | Australian Bank Bill Swap Bid Rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate of LIBOR plus | 1.125% | 1.125% |  |
Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate maturities of long-term debt for 2018 | $ 100,000 |  |  |

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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