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Debt - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  |  |  |  | 9 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended |  | 9 Months Ended |  | 9 Months Ended | 1 Months Ended | 9 Months Ended |  | 1 Months Ended |  | 1 Months Ended | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Sep. 30, 2013 Loan Agreement | Nov. 27, 2012 Loan Agreement | Apr. 25, 2013 Convertible Senior Notes | Sep. 30, 2013 Amended and Restated Credit Agreement | Apr. 23, 2012 Unsecured Debt Convertible Senior Notes | Sep. 30, 2013 Unsecured Debt Convertible Senior Notes | Sep. 30, 2013 Unsecured Debt Convertible Senior Notes Scenario 1 | Sep. 30, 2013 Unsecured Debt Convertible Senior Notes Scenario 2 | Sep. 30, 2013 Amended Credit Agreement | May 08, 2012 Revolving Credit Facility | Sep. 30, 2013 Revolving Credit Facility | Sep. 30, 2013 Revolving Credit Facility Amended and Restated Credit Agreement | Sep. 30, 2013 Revolving Credit Facility Amended and Restated Credit Agreement Option to increase subject to certain conditions | Sep. 30, 2013 Revolving Credit Facility Amended and Restated Credit Agreement Swing Line Loan | Sep. 30, 2013 Revolving Credit Facility Amended and Restated Credit Agreement LIBOR | Sep. 30, 2013 Revolving Credit Facility Amended and Restated Credit Agreement Base Rate | Apr. 25, 2013 Term Loan Credit Facilty | Sep. 30, 2013 Term Loan Credit Facilty | Dec. 31, 2012 Term Loan Credit Facilty | Apr. 25, 2013 Term Loan Credit Facilty LIBOR | Apr. 25, 2013 Term Loan Credit Facilty Base Rate | May 08, 2012 Term Loan Credit Facilty Senior Secured Credit Facility | May 08, 2012 Term Loan Credit Facilty Incremental Senior Credit Facility | Apr. 25, 2013 Term Loan Credit Facilty Amended Credit Agreement | Sep. 30, 2013 Term Loan Credit Facilty Libor | Sep. 30, 2013 Term Loan Credit Facilty Base Rate | Sep. 30, 2013 Letter Of Credit Subfacility Revolving Credit Facility Amended and Restated Credit Agreement | Sep. 30, 2013 Minimum Unsecured Debt Convertible Senior Notes Scenario 1 | Sep. 30, 2013 Minimum Revolving Credit Facility Amended and Restated Credit Agreement LIBOR | Sep. 30, 2013 Minimum Revolving Credit Facility Amended and Restated Credit Agreement Base Rate | Sep. 30, 2013 Minimum Term Loan Credit Facilty Through September 30, 2013 | Sep. 30, 2013 Minimum Term Loan Credit Facilty Thereafter through September 30, 2015 | Sep. 30, 2013 Minimum Term Loan Credit Facilty Thereafter | Sep. 30, 2013 Maximum Revolving Credit Facility Amended and Restated Credit Agreement | Sep. 30, 2013 Maximum Term Loan Credit Facilty Through September 30, 2013 | Sep. 30, 2013 Maximum Term Loan Credit Facilty Thereafter through September 30, 2015 | Sep. 30, 2013 Maximum Term Loan Credit Facilty Thereafter
Notes issued, due date |  |  |  |  |  |  |  | 2018 |  | 2018 | 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued, aggregate principal amount | $ 407,850,000 |  | $ 407,850,000 |  | $ 450,250,000 |  | $ 2,500,000 |  |  | $ 150,000,000 | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 255,615,000 | $ 297,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued, interest rate |  |  |  |  |  |  | 4.25% | 3.375% |  | 3.375% | 3.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued, interest payment frequency |  |  |  |  |  |  |  |  |  | semi-annually |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes initial conversion rate per 1,000 in principal amount |  |  |  |  |  |  |  |  |  |  | 85.4372 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes conversation for 85.4372 shares of common stock |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes initial conversion price | $ 11.70 |  | $ 11.70 |  |  |  |  |  |  |  | $ 11.70 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes, conversation date |  |  |  |  |  |  |  |  |  |  | Nov. 01, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 days |  |  |  |  |  |  |  |  |
Number of consecutive trading days |  |  |  |  |  |  |  |  |  |  |  | 30 days | 0 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Last reported sale price of common stock as percentage of conversion price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130.00% |  |  |  |  |  |  |  |  |
Convertible senior notes, trading price per $1,000 principal amount of notes as percentage of the product of the last reported sale price of common stock and the conversion rate |  |  |  |  |  |  |  |  |  |  |  |  | 98.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from notes issued |  |  | 0 | 292,500,000 |  |  |  |  |  |  | 145,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated implied interest rate |  |  |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of liability component upon issuance |  |  |  |  |  |  |  |  |  |  | 123,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference between cash proceeds before offering expenses and the estimated fair value of liability component |  |  |  |  |  |  |  |  |  |  | 21,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible senior notes |  |  |  |  |  |  |  |  |  |  | 145,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 08, 2017 |  |  |  |  | May 08, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 | 200,000,000 | 10,000,000 |  |  |  |  |  |  |  |  | 75,000,000 |  |  |  | 15,000,000 |  |  |  |  |  |  |  |  |  |
Credit facility, interest rate above basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.25% | 1.25% |  |  |  | 3.50% | 2.50% |  |  |  | 4.75% | 3.75% |  |  | 1.75% | 0.75% |  |  |  |  |  |  |
Credit facility, unused line fee monthly payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Required minimum fixed charge coverage ratio when availability under the Revolver is less than 12.5% of the total revolving commitment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.1 |  |  |
Excess availability as a percentage of total revolving commitment below which minimum fixed charge coverage ratio maintained |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Availability percentage threshold of total revolving commitment below which amounts in deposit accounts will be transferred daily in to blocked account |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 208,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |  |  |  | 300,000,000 |  | 297,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Paid |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long term debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 378,037,000 |  | 378,037,000 |  | 416,849,000 | 2,200,000 |  |  |  |  |  |  |  | 277,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.0 |  | 1.0 | 1.0 | 1.0 |  | 4.5 | 4.0 | 3.5
Line of credit facility potential term extension period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 91 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt amortization percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Productive Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
London interbank offered rate interest rate foor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion of long-term debt | 3,240,000 |  | 3,240,000 |  | 3,381,000 | 500,000 |  |  |  |  |  |  |  | 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs paid |  |  | 981,000 | 5,065,000 |  |  |  |  |  |  |  |  |  | 8,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | 6,252,000 | 7,760,000 | 20,364,000 | 13,934,000 |  |  |  |  |  |  |  |  |  | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, decrease, repayments |  |  | 910,000 | 270,786,000 |  |  |  |  |  |  |  |  |  |  | 51,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of tranche loan amount on equal quarterly installments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured leverage ratio |  |  |  |  |  |  |  |  | 1.3:1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated amortization |  |  | $ 3,455,000 | $ 1,865,000 |  |  |  |  |  |  |  |  |  | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 + Details
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