Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Earnings Per Share - Additional Information (Detail) - shares shares in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	May. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Antidilutive stock options outstanding (in shares)		145	205	145	116
Shares of common stock issued upon vesting of restricted stock (in shares)		19	10	418	382
Common stock issued (in shares)	5,750
Convertible Debt [Member] \| 1.75% Senior Notes due 2017 [Member]
Debt Instrument [Line Items]
Interest rate		1.75%	1.75%	1.75%	1.75%	1.75%