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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 |  |
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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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