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DEBT - Narrative (Detail) (USD $)							0 Months Ended		6 Months Ended	0 Months Ended	6 Months Ended	0 Months Ended									0 Months Ended
	Jun. 30, 2014	Dec. 31, 2013		Jun. 30, 2014 Revolving Credit Facility	Dec. 31, 2013 Revolving Credit Facility	Jun. 21, 2013 Revolving Credit Facility	Jun. 21, 2013 Revolving Credit Facility Option (ii), (x)	Jun. 21, 2013 Revolving Credit Facility Option (ii), (z)	Jun. 30, 2014 Revolving Credit Facility Minimum	Jun. 21, 2013 Revolving Credit Facility Minimum Option (i)	Jun. 30, 2014 Revolving Credit Facility Maximum	Jun. 21, 2013 Revolving Credit Facility Maximum Option (i)	Jun. 08, 2011 Revolving Credit Facility August 2010 Amendment	Jun. 08, 2011 Revolving Credit Facility June 2011 Amendment	Jun. 08, 2011 Revolving Credit Facility June 2011 Amendment Minimum	Jun. 08, 2011 Revolving Credit Facility June 2011 Amendment Maximum	May 11, 2012 Revolving Credit Facility May 2012 Amendment Maximum	Jun. 21, 2013 Revolving Credit Facility June 2013 Amendment Maximum	Jun. 21, 2013 Revolving Credit Facility June 2013 Amendment Leverage Ratio after March 31, 2015	Jun. 21, 2013 Revolving Credit Facility June 2013 Amendment Maximum Levarage Ratio July 01, 2014 through March 31.2015	Jun. 15, 2011 2016 Convertible Senior Notes	Jun. 30, 2014 2016 Convertible Senior Notes	Dec. 31, 2013 2016 Convertible Senior Notes
Debt Instrument [Line Items]
Senior credit facility, maximum borrowing capacity															$ 450,000,000	$ 600,000,000
Reallocated term loan														150,000,000
Additional commitments														200,000,000
Line of credit facility, expiration date													Aug. 10, 2015	Jun. 08, 2016
Leverage ratio																	3.75	4.25	3.75	4.00
Interest rates available to the Company at its option							0.50%	1.00%		1.00%		1.75%
Cash balance threshold above which excess amount is not subject to any restriction of use or investment						40,000,000
Line of credit, commitment fee percentage									0.15%		0.30%
Line of credit facility outstanding				421,900,000	186,900,000
Weighted average interest rate on debt				1.70%	2.00%
Available borrowings under senior secured revolving credit facility				178,100,000
Fair value of outstanding borrowings				421,700,000																		246,000,000
Principal amount outstanding																					230,000,000	230,000,000	230,000,000
Interest rate on debt																					1.625%
Portion of the debt proceeds that was classified as equity at the time of the offering																					43,200,000
Effective interest rate implicit in the liability component																					5.60%
Carrying amount of liability	209,096,000	205,182,000	[1]																			209,100,000	205,200,000
Unamortized discount																						20,900,000	24,800,000
Common stock based on initial conversion rate ratio (in shares)																					17.4092
Principal amount to be considered for conversion purpose																					1,000
Initial conversion price, per share																					$ 57.44
Maximum selling price of company's common stock																					150.00%
Principal amount of notes per average trading price																					$ 1,000
Maximum average conversion value of the Notes																					98.00%
Earliest conversion date																					June 15, 2016
Strike price of the call transaction (in dollars per share)																					$ 57.44
Strike price of warrant transactions (in dollars per share)																					$ 70.05
[1] See Note 1 of these condensed consolidated financial statements for discussion of the impact of the change in accounting for the medical device excise tax.

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