Commitments and Contingencies - Additional Information (Detail) € in Millions, $ in Millions							1 Months Ended	9 Months Ended
	Sep. 25, 2015 USD ($)	Feb. 10, 2015 USD ($) Plaintiff	Dec. 31, 2014 USD ($)	Jul. 23, 2014 EUR (€)	Sep. 28, 2012 Plaintiff	Apr. 23, 2007 Plaintiff	Oct. 31, 2015 USD ($) Plaintiff	Sep. 25, 2015 USD ($) Agreement	May. 31, 2012 USD ($)	Mar. 09, 2010 USD ($)
Contingencies And Commitments [Line Items]
Number of existing real estate lease agreements | Agreement								2
Real estate lease agreements, expiry date								Aug. 31, 2015
Lease, renewal term								5 years
Residual guarantee amount								$ 40.0
Increase in residual guarantee amount								17.0
Cash received from lessor at inception of new leases	$ 17.0							17.0
Aggregate liability in anticipation of a settlement	26.0							26.0
Recoveries from insurance contracts in connection with Bashkirian Airways	$ 11.0		$ 11.0
Number of plaintiffs re-filed their complaint against ACSS | Plaintiff						30
Compensatory damages									$ 48.0	$ 6.7
Number of plaintiffs released their claims against ACSS | Plaintiff					18
Number of plaintiffs settled their claims against ACSS | Plaintiff		12
Aggregate expenses incurred by plaintiff		$ 11.0
Award amount paid by insurer into escrow account								$ 11.0
Subsequent Event [Member]
Contingencies And Commitments [Line Items]
Aggregate payments made from escrow account							$ 7.0
Discount on litigation settlement							$ 0.1
Subsequent Event [Member] | Settled Litigation [Member]
Contingencies And Commitments [Line Items]
Number of plaintiffs settled their claims against ACSS | Plaintiff							8
Subsequent Event [Member] | Pending Litigation [Member]
Contingencies And Commitments [Line Items]
Number of plaintiffs settled their claims against ACSS | Plaintiff							4
Property Damages [Member]
Contingencies And Commitments [Line Items]
Claims for estimated damages | €				€ 11
Business Interruption [Member]
Contingencies And Commitments [Line Items]
Claims for estimated damages | €				€ 35