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Debt - Additional Information (Detail) (USD $) | 12 Months Ended |  |  |  |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  |  | 0 Months Ended |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Loan Agreement | Nov. 27, 2012 Loan Agreement | Dec. 31, 2013 Convertible Senior Notes | Apr. 25, 2013 Convertible Senior Notes | Dec. 31, 2013 Amended and Restated Credit Agreement | Apr. 23, 2012 Unsecured Debt Convertible Senior Notes | Dec. 31, 2013 Unsecured Debt Convertible Senior Notes | Dec. 31, 2013 Unsecured Debt Convertible Senior Notes Scenario 1 | Dec. 31, 2013 Unsecured Debt Convertible Senior Notes Scenario 2 | Dec. 31, 2013 Amended Credit Agreement | Dec. 31, 2012 Amended Credit Agreement | Apr. 25, 2013 Amended Credit Agreement | Dec. 31, 2013 Amended Credit Agreement Loan Agreement | Dec. 31, 2012 Amended Credit Agreement Loan Agreement | May 08, 2012 Revolving Credit Facility | Dec. 31, 2013 Revolving Credit Facility | Dec. 31, 2013 Revolving Credit Facility Amended and Restated Credit Agreement | Dec. 31, 2013 Revolving Credit Facility Amended and Restated Credit Agreement Option to increase subject to certain conditions | Dec. 31, 2013 Revolving Credit Facility Amended and Restated Credit Agreement Swing Line Loan | Apr. 25, 2013 Term Loan Credit Facilty | Dec. 31, 2012 Term Loan Credit Facilty | Dec. 31, 2013 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 | Dec. 31, 2013 Letter Of Credit Subfacility Revolving Credit Facility Amended and Restated Credit Agreement | Dec. 31, 2013 Minimum Unsecured Debt Convertible Senior Notes Scenario 1 | Dec. 31, 2013 Minimum Revolving Credit Facility Amended and Restated Credit Agreement | Dec. 31, 2013 Minimum Revolving Credit Facility Amended and Restated Credit Agreement LIBOR | Dec. 31, 2013 Minimum Revolving Credit Facility Amended and Restated Credit Agreement Base Rate | Dec. 31, 2013 Minimum Term Loan Credit Facilty Through September 30, 2013 | Dec. 31, 2013 Minimum Term Loan Credit Facilty Thereafter through September 30, 2015 | Dec. 31, 2013 Minimum Term Loan Credit Facilty Thereafter | Dec. 31, 2013 Maximum Revolving Credit Facility Amended and Restated Credit Agreement | Dec. 31, 2013 Maximum Revolving Credit Facility Amended and Restated Credit Agreement LIBOR | Dec. 31, 2013 Maximum Revolving Credit Facility Amended and Restated Credit Agreement Base Rate | Dec. 31, 2013 Maximum Term Loan Credit Facilty Through September 30, 2013 | Dec. 31, 2013 Maximum Term Loan Credit Facilty Thereafter through September 30, 2015 | Dec. 31, 2013 Maximum Term Loan Credit Facilty Thereafter
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued, due date |  |  |  |  |  |  | 2018 |  | 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued, aggregate principal amount | $ 387,042,000 | $ 450,250,000 |  |  | $ 2,500,000 | $ 150,000,000 |  |  | $ 150,000,000 |  |  |  |  |  |  | $ 62,800,000 | $ 2,300,000 |  |  |  |  |  |  | $ 297,750,000 | $ 234,923,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued, interest rate |  |  |  |  | 4.25% |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes, conversation date |  |  |  |  |  |  |  |  |  | Nov. 01, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 days |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive trading days |  |  |  |  |  |  |  |  |  |  | 30 days | 5 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 | 0 |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% | 2.50% |  |  |  |  |  |  | 1.75% | 0.75% |  |  |  |  | 2.25% | 1.25% |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 254,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |  | 300,000,000 |  | 297,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Paid |  |  |  |  |  |  |  |  |  |  |  |  | 14,900,000 | 10,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 358,890,000 | 416,849,000 |  | 2,100,000 |  |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion of long-term debt | 3,245,000 | 3,381,000 |  | 500,000 |  |  |  |  |  |  |  |  | 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs paid | 981,000 | 5,134,000 | 1,989,000 |  |  |  |  |  |  |  |  |  | 8,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | 26,308,000 | 21,724,000 | 4,136,000 |  |  |  |  |  |  |  |  |  | 900,000 | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, decrease, repayments | 1,166,000 | 271,015,000 | 838,705,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,000,000 |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of tranche loan amount on equal quarterly installments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured leverage ratio |  |  |  |  |  |  |  | 0.9:1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  | 60,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated amortization | 4,643,000 | 2,972,000 | 0 |  |  |  |  |  |  |  |  |  | 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Amount |  |  |  |  |  |  |  |  |  | $ 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Latest date when the debt instrument can be converted into equity, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + 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 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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