Fair Value Measurements - Schedule of Fair Value Information for Financial Assets and Liabilities Carried on Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financial Liabilities:
Revolving credit facility	$ 0	$ 15,000
Total long-term debt	211,648	45,504
Carrying Value [Member]
Financial Liabilities:
Revolving credit facility		15,000
Total long-term debt	211,627	45,473
Carrying Value [Member] | 4.75% Convertible Senior Notes [Member]
Financial Liabilities:
Total long-term debt	166,596
Carrying Value [Member] | 4.25% Convertible Senior Notes [Member]
Financial Liabilities:
Total long-term debt	23,916	23,885
Carrying Value [Member] | 3.90% Promissory Note [Member]
Financial Liabilities:
Total long-term debt	9,117	9,287
Carrying Value [Member] | 3.75% Callable Promissory Note
Financial Liabilities:
Total long-term debt	6,973	7,153
Carrying Value [Member] | 4.55% Promissory Note [Member]
Financial Liabilities:
Total long-term debt	5,025	5,148
Estimate of Fair Value Measurement [Member]
Financial Liabilities:
Revolving credit facility		15,000
Total long-term debt	225,939	57,639
Estimate of Fair Value Measurement [Member] | (Level 2) [Member]
Financial Liabilities:
Revolving credit facility		15,000
Total long-term debt	205,665	33,248
Estimate of Fair Value Measurement [Member] | (Level 3) [Member]
Financial Liabilities:
Total long-term debt	20,274	24,391
Estimate of Fair Value Measurement [Member] | 4.75% Convertible Senior Notes [Member]
Financial Liabilities:
Total long-term debt	178,522
Estimate of Fair Value Measurement [Member] | 4.75% Convertible Senior Notes [Member] | (Level 2) [Member]
Financial Liabilities:
Total long-term debt	178,522
Estimate of Fair Value Measurement [Member] | 4.25% Convertible Senior Notes [Member]
Financial Liabilities:
Total long-term debt	27,143	33,248
Estimate of Fair Value Measurement [Member] | 4.25% Convertible Senior Notes [Member] | (Level 2) [Member]
Financial Liabilities:
Total long-term debt	27,143	33,248
Estimate of Fair Value Measurement [Member] | 3.90% Promissory Note [Member]
Financial Liabilities:
Total long-term debt	8,711	10,488
Estimate of Fair Value Measurement [Member] | 3.90% Promissory Note [Member] | (Level 3) [Member]
Financial Liabilities:
Total long-term debt	8,711	10,488
Estimate of Fair Value Measurement [Member] | 3.75% Callable Promissory Note
Financial Liabilities:
Total long-term debt	6,604	7,852
Estimate of Fair Value Measurement [Member] | 3.75% Callable Promissory Note | (Level 3) [Member]
Financial Liabilities:
Total long-term debt	6,604	7,852
Estimate of Fair Value Measurement [Member] | 4.55% Promissory Note [Member]
Financial Liabilities:
Total long-term debt	4,959	6,051
Estimate of Fair Value Measurement [Member] | 4.55% Promissory Note [Member] | (Level 3) [Member]
Financial Liabilities:
Total long-term debt	$ 4,959	$ 6,051