Long-Term Debt - Additional Information (Detail) (USD $) | 3 Months Ended | 0 Months Ended | | |
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Oct. 31, 2014 | Oct. 22, 2014 | Feb. 05, 2015 | Mar. 22, 2012 |
day |
Debt Instrument [Line Items] | | | | | | | |
Payments on borrowings on credit facilities | $31,600,000 | $0 | | | | | |
Utilized portion of credit facility | 85,500,000 | | 87,750,000 | | | | |
Utilized portion of credit facility , due with in one year | 10,125,000 | | 9,563,000 | | | | |
Credit facility, available to be utilized after restriction | 59,977,000 | | | | | | |
Document Period End Date | 31-Mar-15 | | | | | | |
Third Amended Restated Credit Agreement | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Maximum borrowings under senior unsecured revolving credit facility | | | | 190,000,000 | | | |
Allowable restructuring charges | | | | | | 20,000,000 | |
Financing fees classified as a debt extinguishment | | | 388,000 | | | | |
Amortization, deferred finance costs | | | | 3,080,000 | | | |
Debt Instrument, Covenant, Fixed Charge Coverage Minimum | | | | 1.5 | | | |
Third Amended Restated Credit Agreement | Minimum | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Covenant, Leverage Ratio | | | | 2.75 | | | |
Third Amended Restated Credit Agreement | Maximum | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Covenant, Leverage Ratio | | | | 2.5 | | | |
Second Amended Restated Credit Agreement | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Maximum borrowings under senior unsecured revolving credit facility | | | | | | | 325,000,000 |
BBA LIBOR Rate | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Interest rate at the end of period | 0.18% | | | | | | |
Interest rate at the end of period, effective | 3.42% | | | | | | |
BBA LIBOR Rate | Third Amended Restated Credit Agreement | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Interest rate at the end of period | | | | 1.00% | | | |
BBA LIBOR Rate | Third Amended Restated Credit Agreement | Minimum | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Interest rate at the end of period | | | | 2.50% | | | |
BBA LIBOR Rate | Third Amended Restated Credit Agreement | Maximum | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Interest rate at the end of period | | | | 3.25% | | | |
Prime Lending Rate | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Interest rate at the end of period | 3.25% | | | | | | |
Prime Lending Rate | Third Amended Restated Credit Agreement | Minimum | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Interest rate at the end of period | | | | 1.50% | | | |
Prime Lending Rate | Third Amended Restated Credit Agreement | Maximum | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Interest rate at the end of period | | | | 2.25% | | | |
Federal Funds Rate | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Interest rate at the end of period | 0.06% | | | | | | |
Federal Funds Rate | Third Amended Restated Credit Agreement | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Interest rate at the end of period | | | | 0.50% | | | |
Revolving Credit Facility | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Utilized portion of credit facility | 0 | | | | | | |
Letter of Credit | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Utilized portion of credit facility | 294,000 | | | | | | |
Senior Unsecured Revolving Credit Facility | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Payments on borrowings on credit facilities | | | | 98,900,000 | | | |
Senior Unsecured Revolving Credit Facility | Third Amended Restated Credit Agreement | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Maximum borrowings under senior unsecured revolving credit facility | | | | 100,000,000 | | | |
Senior Unsecured Revolving Credit Facility | Third Amended Restated Credit Agreement | Minimum | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | | | | 0.35% | | | |
Senior Unsecured Revolving Credit Facility | Third Amended Restated Credit Agreement | Maximum | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | | | | 0.50% | | | |
Senior Unsecured Revolving Credit Facility | Second Amended Restated Credit Agreement | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Maximum borrowings under senior unsecured revolving credit facility | | | | | | | 225,000,000 |
Senior Unsecured Revolving Credit Facility | Letter of Credit | Third Amended Restated Credit Agreement | Minimum | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Line of Credit Facility, Commitment Fee Percentage | | | | 2.50% | | | |
Senior Unsecured Revolving Credit Facility | Letter of Credit | Third Amended Restated Credit Agreement | Maximum | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Line of Credit Facility, Commitment Fee Percentage | | | | 3.25% | | | |
Term Loan Facility | Third Amended Restated Credit Agreement | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Maximum borrowings under senior unsecured revolving credit facility | | | | 90,000,000 | | | |
Term Loan Facility | Second Amended Restated Credit Agreement | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Maximum borrowings under senior unsecured revolving credit facility | | | | | | | 100,000,000 |
Term Loan Facility | First Quarter | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Amortization payments on outstanding principal amount of term loans, in 2016 | 2,813,000 | | | | | | |
Amortization payments on outstanding principal amount of term loans, in 2017 | 3,375,000 | | | | | | |
Term Loan Facility | Second Quarter | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Amortization payments on outstanding principal amount of term loans, in 2015 | 2,250,000 | | | | | | |
Amortization payments on outstanding principal amount of term loans, in 2016 | 2,813,000 | | | | | | |
Amortization payments on outstanding principal amount of term loans, in 2017 | 3,375,000 | | | | | | |
Term Loan Facility | Third Quarter | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Amortization payments on outstanding principal amount of term loans, in 2015 | 2,250,000 | | | | | | |
Amortization payments on outstanding principal amount of term loans, in 2016 | 2,813,000 | | | | | | |
Amortization payments on outstanding principal amount of term loans, in 2017 | 3,375,000 | | | | | | |
Term Loan Facility | Fourth Quarter | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Amortization payments on outstanding principal amount of term loans, in 2015 | 2,813,000 | | | | | | |
Amortization payments on outstanding principal amount of term loans, in 2016 | 3,375,000 | | | | | | |
3.50% Convertible Senior Notes Due 2019 | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt instrument, aggregate principal amount | | | | | 143,750,000 | | |
Debt instrument, option granted to initial purchasers and exercised, aggregate principal amount | | | | | 18,750,000 | | |
Debt instrument, interest rate | | | | | 3.50% | | |
Net proceeds from sale of notes | | | | | 139,031,000 | | |
Fees and expenses | | | | | 4,719,000 | | |
Payments for capped call transactions | | | | | 16,531,000 | | |
Repayments of term loan outstanding | | | | | 82,500,000 | | |
Repayments of borrowings under revolving credit facility | | | | | 40,000,000 | | |
Debt instrument, conversion rate per one thousand dollar principal amount of the Notes | | | | | 187.7405 | | |
Debt instrument, conversion price per share | | | | | $5.33 | | |
Debt instrument, convertible, threshold percentage of outstanding shares of common stock that require stockholder approval | | | | | 19.99% | | |
Convertible notes, shares convertible | | | | | 27,000,000 | | |
Debt Instrument, Convertible, Threshold Trading Days | | | | | 20 | | |
Debt Instrument, Convertible, Threshold Consecutive Trading Days | | | | | 30 days | | |
Debt Instrument, Measurement Period | | | | | 5 days | | |
Debt instrument fair value | | | | | 122,829,000 | | |
Carrying value of permanent equity component reported in additional paid-in-capital | | | | | 20,228,000 | | |
3.50% Convertible Senior Notes Due 2019 | Minimum | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger | | | | | 98.00% | | |
3.50% Convertible Senior Notes Due 2019 | Maximum | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger | | | | | 130.00% | | |
3.50% Convertible Senior Notes Due 2019 | Equity Component | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Fees and expenses | | | | | $693,000 | | |
3.50% Convertible Senior Notes Due 2019 | Call Option | | | | | | | |
Debt Instrument [Line Items] | | | | | | | |
Debt instrument, initial cap price under capped call transaction | | | | | $7.04 | | |