Subsequent Events - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended		0 Months Ended				0 Months Ended		0 Months Ended		0 Months Ended									0 Months Ended
	Sep. 30, 2014 London Interbank Offered Rate (LIBOR)	Sep. 30, 2014 Federal Funds Rate	Oct. 04, 2014 Subsequent Event	Oct. 22, 2014 Subsequent Event 3.50% Convertible Senior Notes Due 2019	Oct. 22, 2014 Subsequent Event 3.50% Convertible Senior Notes Due 2019	Oct. 21, 2014 Subsequent Event 3.50% Convertible Senior Notes Due 2019	Oct. 22, 2014 Subsequent Event 3.50% Convertible Senior Notes Due 2019 Minimum	Oct. 31, 2014 Subsequent Event Third Amended Restated Credit Agreement	Oct. 31, 2014 Subsequent Event Third Amended Restated Credit Agreement Minimum	Oct. 31, 2014 Subsequent Event Third Amended Restated Credit Agreement Maximum	Oct. 31, 2014 Subsequent Event London Interbank Offered Rate (LIBOR) Third Amended Restated Credit Agreement	Oct. 31, 2014 Subsequent Event London Interbank Offered Rate (LIBOR) Third Amended Restated Credit Agreement Minimum Scenario 1	Oct. 31, 2014 Subsequent Event London Interbank Offered Rate (LIBOR) Third Amended Restated Credit Agreement Minimum Scenario 2	Oct. 31, 2014 Subsequent Event London Interbank Offered Rate (LIBOR) Third Amended Restated Credit Agreement Maximum Scenario 1	Oct. 31, 2014 Subsequent Event London Interbank Offered Rate (LIBOR) Third Amended Restated Credit Agreement Maximum Scenario 2	Oct. 31, 2014 Subsequent Event Federal Funds Rate Third Amended Restated Credit Agreement	Oct. 21, 2014 Subsequent Event Call Option 3.50% Convertible Senior Notes Due 2019	Oct. 31, 2014 Subsequent Event Senior Unsecured Revolving Credit Facility Third Amended Restated Credit Agreement	Oct. 31, 2014 Subsequent Event Senior Unsecured Revolving Credit Facility Third Amended Restated Credit Agreement	Oct. 31, 2014 Subsequent Event Senior Unsecured Revolving Credit Facility Third Amended Restated Credit Agreement Minimum	Oct. 31, 2014 Subsequent Event Senior Unsecured Revolving Credit Facility Third Amended Restated Credit Agreement Maximum	Oct. 31, 2014 Subsequent Event Senior Unsecured Revolving Credit Facility Letter of Credit Third Amended Restated Credit Agreement Minimum	Oct. 31, 2014 Subsequent Event Senior Unsecured Revolving Credit Facility Letter of Credit Third Amended Restated Credit Agreement Maximum	Oct. 31, 2014 Subsequent Event Term Loan Facility Third Amended Restated Credit Agreement	Oct. 31, 2014 Subsequent Event Term Loan Facility Third Amended Restated Credit Agreement	Oct. 31, 2014 Subsequent Event Term Loan Facility Third Amended Restated Credit Agreement Fourth Quarter	Oct. 31, 2014 Subsequent Event Term Loan Facility Third Amended Restated Credit Agreement First Quarter	Oct. 31, 2014 Subsequent Event Term Loan Facility Third Amended Restated Credit Agreement Second Quarter	Oct. 31, 2014 Subsequent Event Term Loan Facility Third Amended Restated Credit Agreement Third Quarter
Subsequent Event [Line Items]
Employment Separation Date for Mr. Iannuzzi			Jun. 30, 2015
Additional severance payment for Mr. Iannuzzi			$ 2,000
Maximum borrowings under senior unsecured revolving credit facility								190,000											100,000						90,000
Debt instrument maturity date				Oct. 15, 2019														Oct. 31, 2017						Oct. 31, 2017
Amortization payments on outstanding principal amount of term loans, fiscal year																										2,250
Amortization payments on outstanding principal amount of term loans, 2015																										2,813	2,250	2,250	2,250
Amortization payments on outstanding principal amount of term loans, 2016																										3,375	2,813	2,813	2,813
Amortization payments on outstanding principal amount of term loans, 2017																											3,375	3,375	3,375
Debt instrument, basis spread on variable rate	0.15%	0.07%									1.00%	2.50%	1.50%	3.25%	2.25%	0.50%
Fee on all outstanding amounts of letters of credit																						2.50%	3.25%
Commitment fee on the unused portion of the revolving credit facility																				0.35%	0.50%
Consolidated Leverage Ratio								250.00%		275.00%
Consolidated Fixed Charge Coverage Ratio									150.00%
Debt instrument, aggregate principal amount					143,750
Debt instrument, option granted to initial purchasers and exercised, aggregate principal amount						$ 18,750
Debt instrument, interest rate					3.50%
Debt instrument, convertible, latest date, upon triggering event				Jan. 15, 2019
Debt instrument, conversion rate				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%
Debt instrument, initial cap price under capped call transaction																	$ 7.035