Ownership, Description of Business, and Summary of Significant Accounting Policies - Reconciliation of Shares Used in Calculating Earnings Per Basic and Diluted Shares (Detail) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Weighted average common shares outstanding-basic (in shares)	25,722,000	25,853,000	24,659,000
Dilutive effect of stock-based awards (in shares)	253,000	556,000	950,000
Dilutive effect of convertible senior notes (in shares)	672,000	1,082,000	595,000
Dilutive effect of warrants (in shares)	0	4,000	0
Weighted average common shares outstanding-diluted (in shares)	26,647,000	27,495,000	26,204,000
Anti-dilutive employee stock options outstanding, value	0	0	0