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Debt - Additional Information (Detail) - USD ($) |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 27, 2015 | Mar. 13, 2014 | Apr. 01, 2009 | Mar. 31, 2009 | Jul. 05, 2015 | Jul. 05, 2015 | Jun. 29, 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 | $ 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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