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Long Term Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified |  | 1 Months Ended |  |  |  |  | 1 Months Ended |  | 1 Months Ended
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Jan. 18, 2013 | Jan. 31, 2013 Minimum | Jan. 31, 2013 Maximum | Jan. 31, 2013 Federal funds rate | Jan. 31, 2013 One Month LIBOR Rate | Jan. 18, 2013 LIBOR Loans Minimum | Jan. 18, 2013 LIBOR Loans Maximum | Jan. 18, 2013 Base Rate Loans Minimum | Jan. 18, 2013 Base Rate Loans Maximum | Jan. 31, 2013 Standby Letters of Credit | Apr. 30, 2012 Standby Letters of Credit | Jan. 31, 2013 Revolving Credit Facility | Jan. 18, 2013 Revolving Credit Facility | Jan. 31, 2013 Revolving Credit Facility Letter of Credit
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Revolving Facility, aggregate availability |  |  |  |  |  |  |  |  |  |  |  |  | $ 75 |
Senior Unsecured Revolving Facility, additional borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | 50 |  | 15
Senior Unsecured Revolving Facility, maturity date |  |  |  |  |  |  |  |  |  |  |  | Jan. 18, 2018 |  |
Applicable margin on variable interest rate |  |  |  | 1.50% | 1.50% | 0.50% | 1.50% | 0.00% | 0.25% |  |  |  |  |
Quarterly Commitment Fees on the Facility's unused commitments |  | 0.25% | 0.35% |  |  |  |  |  |  |  |  |  |  |
Financial covenants amount | 50 |  |  |  |  |  |  |  |  |  |  |  |  |
Previous Facility, standby letters of credit |  |  |  |  |  |  |  |  |  | 2.7 | 2.9 |  |  |
Previous Facility, restricted cash |  |  |  |  |  |  |  |  |  | $ 2.9 | $ 10.0 |  |  |

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 80 -Subparagraph Exhibit 4-8, 3 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + Details
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