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Long-term Debt - U.S. Bank Debt (Details) (USD $) |  | 3 Months Ended |  | 3 Months Ended |  |  |  |  |  | 9 Months Ended |  |  |  |  |  |  |  | 12 Months Ended | 3 Months Ended |  | 10 Months Ended | 3 Months Ended
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Oct. 10, 2012 Revolving credit and term loan facilities [Member] | Dec. 31, 2012 Senior Secured Term Loan B [Member] | Oct. 10, 2012 Senior Secured Term Loan B [Member] | Dec. 31, 2012 Senior Secured Term Loan A [Member] | Dec. 31, 2012 U.S. bank debt and receivables facility [Member] | Dec. 31, 2011 U.S. bank debt and receivables facility [Member] | Dec. 31, 2012 Receivables Facility [Member] | Dec. 17, 2012 Receivables Facility [Member] | Dec. 31, 2011 Receivables Facility [Member] | Oct. 10, 2012 Term loan facility [Member] | Oct. 10, 2012 Revolving credit facility [Member] | Dec. 31, 2012 Revolving credit facility [Member] | Dec. 31, 2011 Revolving credit facility [Member] | Dec. 31, 2012 Letters of credit [Member] | Oct. 10, 2012 Letters of credit [Member] | Dec. 31, 2011 Letters of credit [Member] | Dec. 31, 2012 Maximum [Member] Receivables Facility [Member] | Dec. 17, 2012 Maximum [Member] Receivables Facility [Member] | Dec. 31, 2012 Refinancing of Debt [Member] Revolving credit and term loan facilities [Member] | Dec. 31, 2011 Refinancing of Debt [Member] Revolving credit and term loan facilities [Member] | Dec. 31, 2012 Refinancing of Debt [Member] Senior Secured Term Loan B [Member] | Dec. 31, 2012 Refinancing of Debt [Member] Senior Secured Term Loan A [Member] | Dec. 31, 2012 Refinancing of Debt [Member] Senior Secured Term Loan A [Member] | Dec. 31, 2012 Refinancing of Debt [Member] Senior Secured Term Loan B [Member] | Dec. 31, 2012 Refinancing of Debt [Member] Revolving credit facility [Member] | Dec. 31, 2012 Principal payment, June 2013 through March 2015 [Member] Senior Secured Term Loan A [Member] | Dec. 31, 2012 Principal payment, June 2015 through September 2017 [Member] Senior Secured Term Loan A [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 217,200,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 | $ 200,000,000 |  |  |
Interest rate, LIBOR plus |  |  |  |  |  |  | 1.20% |  | 1.50% | 3.00% | 3.25% |  |  |  |  |  | 1.35% | 1.75% |  |  | 2.75% | 2.00% |  |  | 2.00% |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum |  |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  | 125,000,000 |  |  | 75,000,000 | 50,000,000 |  |  |  |  |  |  |  |  |  | 250,000,000 |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  |  | Jun. 21, 2017 | Jun. 21, 2016 |  |  |  |  |  |  |  |  |  |  |  | Oct. 11, 2017 | Oct. 11, 2019 | Oct. 11, 2017 |  |
Incremental debt commitments capacity | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan Facility, Required Prepay Premium |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan Facility, Required Prepay Portion Under Excess Cash Flow Sweep Provision [Line Items] |  |  | 5,000,000.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,300,000 |  | 23,900,000 |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility, Amount Outstanding |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  | 226,700,000 | 101,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount |  |  |  |  | 230,500,000 | 158,800,000 | 51,900,000 |  | 57,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan Facility, Quarterly Principal Payments |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000 | 3,800,000
Term Loan Facility, Principal Payment on Maturity Date |  | 186,000,000 |  | 142,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Debt Extinguishment and Issuance Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,400,000 | 6,800,000 |  |  |  |  |  |  |
Deferred Finance Costs, Noncurrent, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,500,000 | 4,400,000 |  |  |  |  |  |  |
Debt Issuance Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000 | 2,400,000 |  |  |  |  |  |  |
Secured debt, Maximum Borrowing Capacity |  |  |  |  |  |  | 105,000,000 | 90,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of Deferred Debt Issuance Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,100,000 |  |  |  |  |  |  |  |

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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. + 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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