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Debt - Additional Information (Detail) - USD ($) |  |  |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 27, 2015 | Mar. 13, 2014 | Apr. 01, 2009 | Mar. 31, 2009 | Oct. 04, 2015 | Sep. 28, 2014 | Dec. 31, 2014
Debt Instrument |  |  |  |  |  |  |
Term of loan, years | 5 years |  |  |  |  |  |
Pledge percentage of capital stock | 65.00% |  |  |  |  |  |
Payments of long-term debt |  |  |  |  |  | $ 190,975,000 |
Common stock shares were issued for warrants exercised |  |  |  |  |  |  | 21,200,000
Strike price per share of warrant |  |  |  |  |  |  | $ 7.6348
Maximum |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Aggregate principal amount | $ 150,000,000 |  |  |  |  |  |
Commitment fee percentage of unused portion of credit facility | 0.35% |  |  |  |  |  |
Minimum |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Commitment fee percentage of unused portion of credit facility | 0.125% |  |  |  |  |  |
Base Rate | Maximum |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.00% |  |  |  |  |  |
Base Rate | Minimum |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 0.00% |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 2.00% |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 1.00% |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Credit facility, borrowing capacity | $ 350,000,000 |  |  |  |  |  |
Financing cost |  |  |  |  | $ 2,300,000 |  |
Financing cost, amortization term |  |  |  |  | 5 years |  |
4.50% Convertible Senior Notes Due March 15, 2014 |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 190,000,000 | $ 175,000,000 |  |  |
Debt instrument, interest rate, stated percentage |  |  |  | 4.50% |  |  |
Additional aggregate principal amount |  |  | $ 15,000,000 | $ 1,000 |  |  |
Senior notes maturity date |  |  | Mar. 15, 2014 | Mar. 15, 2014 |  |  |
Conversion rate in number of shares |  |  |  | 182.65 |  |  | 131.95
Number of shares excluded for conversion rate calculation |  |  |  |  |  |  | 50.7
Trading days used to determine average price per share |  |  |  |  |  |  | 25 days
Average trading price of common shares |  |  |  |  |  |  | $ 19.74
Payments of long-term debt |  |  |  |  | $ 190,000,000 |  |
Stock issued in conversion of notes |  |  |  |  | 25,100,000 |  |
Stock received and retired |  | 25,100,000 |  |  |  |  |

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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or 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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