Long-Term Debt - Senior Credit Facilities (Detail) (USD $) In Thousands, unless otherwise specified							0 Months Ended			0 Months Ended		0 Months Ended
	Jun. 09, 2014 Senior credit facility	Jun. 25, 2013 Term Loan A Facility Senior credit facility	Jun. 25, 2013 Incremental Loan Arrangement Senior credit facility	Sep. 30, 2014 4.5% Convertible notes due 2014	Jul. 23, 2014 4.5% Convertible notes due 2014	Dec. 31, 2013 4.5% Convertible notes due 2014	Jul. 23, 2014 Delayed Draw Loan Facility As Amended Senior credit facility	Jun. 09, 2014 Delayed Draw Loan Facility As Amended Senior credit facility	Jun. 25, 2013 Delayed Draw Loan Facility As Amended Senior credit facility	Jun. 09, 2014 Delayed Draw Loan Facility As Amended 4.5% Convertible notes due 2014 Senior credit facility	Nov. 03, 2014 Subsequent Event 4.5% Convertible notes due 2014	Nov. 03, 2014 Subsequent Event Delayed Draw Loan Facility As Amended Senior credit facility
Debt Instrument [Line Items]
Debt instrument, amount		$ 56,500	$ 25,000						$ 43,500
Proceeds from Issuance of Debt							3,360					11,202
Debt instrument, repurchased face amount					3,360						11,202
Debt instrument, interest rate percentage				4.50%	4.50%	4.50%
Debt instrument, unused borrowing capacity, amount								18,938
Debt Instrument Cash and Marketable Securities Requirements	$ 35,000
Debt Instrument, maturity period								2015-06		2014-11