Organization and Significant Accounting Policies - Summary of Earnings (Loss) Per Share (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Basic weighted-average shares (in shares)	23,101	22,782	22,286
Conversion of unsecured loan notes (in shares)	0	0	7
Unexercised options and unvested restricted stock units (in shares)	0	0	286
Diluted weighted-average shares (in shares)	23,101	22,782	22,579