Debt - Convertible Senior Notes - Additional Information (Detail)						12 Months Ended
	Oct. 01, 2018 USD ($) $ / shares	Apr. 06, 2016 USD ($)	Oct. 01, 2013	Jul. 01, 2013 USD ($) day	Mar. 15, 2013 USD ($) covenant	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Debt Instrument [Line Items]
Term loan borrowed						$ 607,650,000	$ 253,190,000
Convertible senior notes, proceeds from issuance, amount						$ 0	$ 0	$ 194,818,000
Debt instrument, conversion terms						Beginning July 1, 2013 and prior to the close of business on September 28, 2018, holders may convert all or a portion of the Notes at their option, in multiples of $1,000 principal amount, under the following circumstances: During any fiscal quarter commencing July 1, 2013, if the last reported sale price of the Company’s common stock for at least 20 trading days during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day. As of December 31, 2015 and 2014, the Notes were no convertible. During the five business day period after any five consecutive trading day period (the “measurement period”) in which the trading price per $1,000 principal amount of the Notes for each trading day of the measurement period was less than 98% of the product of the last reported sales price of the Company’s common stock and the conversion rate on each trading day. If the Company calls any or all of the Notes for redemption. Upon the occurrence of specified corporate events, including a merger or a sale of all or substantially all of the Company’s assets.
Debt instrument, terms of redemption						Beginning April 6, 2016, the Company may, at its option, redeem for cash all or part of the Notes plus accrued and unpaid interest. If the Company undergoes a fundamental change (as described in the Indenture), holders may require the Company to repurchase for cash all or part of their Notes in principal amounts of $1,000 or an integral multiple thereof. The fundamental change repurchase price will be equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest.
Debt issuance costs								$ 714,000
2019 Notes [Member]
Debt Instrument [Line Items]
Term loan borrowed					$ 201,250,000.00
Convertible senior notes, additional issued against over-allotment, principal amount					$ 26,250,000.00
Convertible senior notes, maturity date						Apr. 01, 2019
Convertible senior notes, stated interest rate					4.25%
Convertible senior notes, date of first required payment			Oct. 01, 2013
Convertible senior notes, proceeds from issuance, amount					$ 194,800,000
Number of operating covenants | covenant					0
Debt instrument, earliest date of conversion				Jul. 01, 2013
Convertible notes, amount, in multiples, that may be converted				$ 1,000
Convertible senior notes, adjustments to additional paid in capital, debt discount					6.50%
Debt discount recorded in additional paid in capital					$ 22,300,000
Debt issuance costs					6,400,000
Debt issuance cost incurred					$ 5,700,000
2019 Notes [Member] | Quoted prices in active markets using identical assets (Level 1) [Member]
Debt Instrument [Line Items]
Fair value of debt instrument						$ 167,800,000
2019 Notes [Member] | Scenario 1 [Member]
Debt Instrument [Line Items]
Company's common stock for at least trading days | day				20
Consecutive trading days				30 days
2019 Notes [Member] | Scenario 1 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Conversion price on each applicable trading day				130.00%
2019 Notes [Member] | Scenario 2 [Member]
Debt Instrument [Line Items]
Consecutive trading days				5 days
Conversion price on each applicable trading day				98.00%
Debt instrument convertible business days				5 days
Scenario, forecast [Member] | 2019 Notes [Member]
Debt Instrument [Line Items]
Convertible notes, amount, in multiples, that may be converted	$ 1,000	$ 1,000
Debt instrument, latest date of conversion	Mar. 28, 2019
Convertible senior notes, conversion ratio	0.0461723
Convertible senior notes, conversion rate | $ / shares	$ 21.66
Debt instrument, start date of redemption period		Apr. 06, 2016
Convertible senior notes, repurchase price due to fundamental change as percentage of principal amount		100.00%
2019 Notes [Member]
Debt Instrument [Line Items]
Agreement date					Mar. 15, 2013