Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Additional Information (Detail)

v3.7.0.1
Fair Value Measurements - Additional Information (Detail) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Assets and Liabilities At Fair Value On Recurring Basis [Line Items]    
Assets at fair value on recurring basis $ 0 $ 0
Liabilities at fair value on recurring basis 0 0
Long term debt carrying amount 1,822,966,000 1,822,966,000
Long-term debt fair value $ 1,840,777,000 $ 1,850,212,000