Debt - Additional Information (Detail) - USD ($)			3 Months Ended		9 Months Ended
	Sep. 17, 2015	Sep. 04, 2015	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Mar. 19, 2012
Debt Instrument [Line Items]
Principal settlement amount					$ 258,742,000	$ 4,000
Non-cash loss on extinguishment of Convertible Notes			$ 13,216,000		$ 21,087,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 75,000,000
Debt instrument term		1 year			6 months
Interest rate spread on base rate, description					(a) the LIBOR rate, plus an applicable margin ranging from 1.75% to 2.50% per annum, based upon the secured leverage ratio (as defined in the Credit Agreement), or (b) the prime lending rate, plus an applicable margin ranging from 0.75% to 1.50% per annum, based upon the senior secured net leverage ratio (as defined in the Credit Agreement)
Debt instrument maturity date					Mar. 17, 2016
Line of credit facility, interest rate	2.3125%
Line of credit facility, interest rate description					The interest rate for this borrowing was 2.3125% and is applied on an actual 360 day basis.
Revolving Credit Facility [Member] | Multicurrency Sub-facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 20,000,000
Revolving Credit Facility [Member] | Letter of Credit Sub-Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		10,000,000
Revolving Credit Facility [Member] | Swing Line Loan Sub-facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 100,000
Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on base rate		1.75%
Revolving Credit Facility [Member] | LIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on base rate		2.50%
Revolving Credit Facility [Member] | Prime Rate [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on base rate		0.75%
Revolving Credit Facility [Member] | Prime Rate [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on base rate		1.50%
Credit Agreement [Member]
Debt Instrument [Line Items]
Obligations under credit agreement, description					(i) all tangible and intangible assets of the Loan Parties, except for certain customary excluded assets, and (ii) all of the capital stock owned by the Loan Parties thereunder (limited, in the case of the stock of certain non-U.S. subsidiaries of the Company, to 65% of the capital stock of such subsidiaries).
Convertible Notes Due 2017 [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Convertible Notes, payment terms					The Company was required to pay interest semi-annually in arrears on April 1 and October 1 of each year.
Convertible Notes, aggregate principal amount							$ 258,800,000
Aggregate principal amount of convertible notes settled			167,800,000	$ 91,000,000	$ 167,800,000
Principal settlement amount			$ 167,800,000	$ 92,100,000
Common stock, shares issued on redemption of convertible notes			3,539,218	2,099,358
Non-cash loss on extinguishment of Convertible Notes			$ 13,200,000		21,100,000
Forfeited accrued interest payable reclassified to additional paid-in capital			$ 1,400,000		$ 1,700,000