Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Apr. 21, 2015 Plaintiff	May 08, 2015 Complaints
Loss Contingencies [Line Items]
Increase in accrued liabilities	$ (35,020)	$ (31,052)
Subsequent Event [Member]
Loss Contingencies [Line Items]
Number of plaintiffs			3
Central District of California [Member] | Subsequent Event [Member]
Loss Contingencies [Line Items]
Number of putative class action complaints filed				1
Other Operating Expenses [Member]
Loss Contingencies [Line Items]
Increase in accrued liabilities	$ 5,200